CN102045059B - Muti-channel integrator - Google Patents
Muti-channel integrator Download PDFInfo
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- CN102045059B CN102045059B CN 200910207707 CN200910207707A CN102045059B CN 102045059 B CN102045059 B CN 102045059B CN 200910207707 CN200910207707 CN 200910207707 CN 200910207707 A CN200910207707 A CN 200910207707A CN 102045059 B CN102045059 B CN 102045059B
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Abstract
The invention discloses a multi-channel integrator, comprising a first switch, a second switch and multiple integral units, wherein the first terminals of the first switch and the second switch are used for receiving reference voltages; each integral unit comprises an operational amplifier, a feedback switch, a third switch, a fourth switch and a feedback capacitor; the second terminal of the operational amplifier is used for receiving a second reference voltage; the first terminal and the second terminal of the feedback switch are respectively coupled with the first input terminal and the first output terminal of the operational amplifier; the first terminal of the third switch is coupled with the first input terminal of the operational amplifier; the first terminal of the forth switch is coupled with the output terminal of the operational amplifier; the first terminal of the feedback capacitor is coupled with the second terminal of the first switch and the second terminal of the third switch; and the second terminal of the feedback capacitor is coupled with the second terminal of the second switch and the second terminal of the fourth switch.
Description
Technical field
The present invention relates to a kind of integrator, and be particularly related to a kind of integrator of a plurality of passages.
Background technology
Flourish along with electronic technology, and the universalness of wireless telecommunications and network, electronic installation miscellaneous becomes the indispensable instrument of life gradually.Yet general common input and output (input/output, I/O) interface similarly is keyboard or mouse, has the operating difficulties of certain degree.By contrast, contact panel is a kind of intuitively, simply the input and output interface.Therefore, contact panel often is applied as the man-machine interface between people and the electronic installation, to carry out control.
In general, contact panel can be divided into electric resistance touch-control panel, optical touch control panel, capacitance type touch-control panel etc.If according to reading (readout) means, then can be divided into current type contact panel (currenttype touch panel) and charge type contact panel (charge type touch panel) etc.Fig. 1 illustrates the schematic diagram of capacitance type touch-control panel (capacitor type touch panel) and traditional reading circuit (readout circuit).Y direction and the X-direction of general capacitance type touch-control panel 110 have many sense wires (sensor line) separately.Article one, can form a coupling capacitance Cp between the sense wire of the sense wire of Y direction and an X-direction.
Each bar sense wire all disposes an integrator 120, and each integrator 120 all disposes an operational amplifier 122 and a back coupling capacitor C fb.The non-inverting input of all operational amplifiers 122 receives the reference voltage V of 0V at the beginning
Ref, and all switches 123 are conducting (turn on), so all sense wires all are charged to 0V.Next each integrator 120 can be with switch 123 cut-offs (turnoff), in order to carry out read operation., suppose without any electric conductor (for example finger) near contact panel 110, as reference voltage V between 123 off periods at switch
RefDuring from the 0V transition to 5V, the integrator 120 of Y direction and X-direction can make two terminal voltages of coupling capacitance Cp be 5V.Owing to do not need coupling capacitance Cp is discharged and recharged, therefore at reference voltage V
RefTransition is during to 5V, and this variation also can be reacted in the output of integrator 120.After each integrator 120 was finished read operation, all switches 123 can be switched on again, so go round and begin again.
When electric conductor (for example finger) during near contact panel 110, correspondence position can form extra capacitor C f (as shown in Figure 1).At switch between 123 off periods, as reference voltage V
RefDuring from the 0V transition to 5V, corresponding integrator 120 need to discharge and recharge extra capacitor Cf via sense wire.Therefore, at reference voltage V
RefTransition is during to 5V, extra capacitor Cf the output OUT of corresponding integrator 120 can change, its formula is OUT=5+[(5V-0V) * Cf]/Cfb.Integrator 120 will read (readout) result and transfer to subsequent conditioning circuit (comprising analog-digital converter and image-processing circuit, not shown at this) judgement position coordinates.By the two different of the sense wire institute read signal and the sense wire institute read signal that does not have extra capacitor Cf that form extra capacitor Cf, so can orient the position that is touched.
As shown from the above formula, if the larger capacitor C fb that then feedbacks of extra capacitor C f must be larger, otherwise be easy to allow the output of integrator 120 reach capacity (saturation) and can not judge touch position.Yet, reaching capacity for fear of the output of integrator 120, the back coupling capacitor C fb of integrator 120 also must increase capacitance (namely increasing area) thereupon.Because each bar sense wire needs an integrator 120, so integrator 120 shared chip areas will be very considerable.
Summary of the invention
The invention provides a kind of Muti-channel integrator, by sharing the shared chip area of integrator of feedbacking electric capacity and significantly reducing a plurality of passages.
One embodiment of the invention propose a kind of Muti-channel integrator, comprise one first switch, a second switch and a plurality of integral unit.The first end of the first switch and second switch receives the first reference voltage.Each integral unit comprises an operational amplifier, a back coupling switch, one the 3rd switch, one the 4th switch and a back coupling electric capacity separately.Operational amplifier has first input end, the second input and output, and wherein the second input receives the second reference voltage.The first end of back coupling switch and first input end and the output that the second end is coupled to respectively operational amplifier.The first end of the 3rd switch is coupled to the first input end of operational amplifier.The first end of the 4th switch is coupled to the output of operational amplifier.The first end of back coupling electric capacity is coupled to the second end of the first switch and the second end of the 3rd switch.The second end of back coupling electric capacity is coupled to the second end of second switch and the second end of the 4th switch.
Another embodiment of the present invention proposes a kind of Muti-channel integrator, comprises one first switch, a second switch, back coupling electric capacity and an a plurality of integral unit.The first end of the first switch and second switch receives the first reference voltage.The first end of back coupling electric capacity and the second end that the second end is coupled to respectively the first switch and the second end of second switch.Each integral unit comprises an operational amplifier, back coupling switch, one the 3rd switch and one the 4th switch separately.Operational amplifier has first input end, the second input and output, and wherein the second input receives the second reference voltage.The first end of back coupling switch and first input end and the output that the second end is coupled to respectively operational amplifier.The first end of the 3rd switch is coupled to the first input end of operational amplifier, and the second end of the 3rd switch is coupled to the first end of back coupling electric capacity.The first end of the 4th switch is coupled to the output of operational amplifier, and the second end of the 4th switch is coupled to the second end of back coupling electric capacity.
Based on above-mentioned, by sharing in turn one group (or one) back coupling electric capacity between a plurality of passages, therefore can significantly reduce the shared chip area of integrator of these passages, and then save cost.
For allowing the above-mentioned feature and advantage of the present invention can be more apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Fig. 1 illustrates the schematic diagram of capacitance type touch-control panel and traditional reading circuit.
Fig. 2 is the circuit diagram that a kind of Muti-channel integrator is described according to the embodiment of the invention.
Fig. 3 is the control sequential according to each switch in the embodiment of the invention key diagram 2.
Fig. 4 is the circuit diagram that another kind of Muti-channel integrator is described according to the embodiment of the invention.
[main element symbol description]
110: contact panel
120: integrator
Cfb: back coupling electric capacity
122,211,411: operational amplifier
123, SW1～SW4, SWfb: switch
200,400: Muti-channel integrator
210-1,210-n, 410-1,410-n: integral unit
Cf: extra electric capacity
Cp: coupling capacitance
RESET: reset signal
RESETB: the inversion signal of reset signal RESET
V
Ref, V
Ref1: reference voltage
S1～S3, S1 ', Sn, Sn ': control signal
Embodiment
Following examples will as example, illustrate the application mode of Muti-channel integrator of the present invention take capacitance type touch-control panel (capacitor type touch panel).Yet range of application of the present invention should be as limit.Any charge type contact panel, or even any circuit or electronic product that needs Muti-channel integrator all can be used it according to the teaching of this specification.
Fig. 2 is the circuit diagram that a kind of Muti-channel integrator is described according to the embodiment of the invention.This Muti-channel integrator 200 has n passage, integral unit of each self-configuring of each passage.Only draw the integral unit 210-1 of first passage and the integral unit 210-n of n passage among the figure, other passages can be analogized it with reference to following explanation.In addition, Muti-channel integrator 200 still has the first interrupteur SW 1 and second switch SW2.The first interrupteur SW 1 all receives the first reference voltage V with the first end of second switch SW2
Ref1The first interrupteur SW 1 is controlled by signal RESETB with second switch SW2, and wherein signal RESETB is the inversion signal of reset signal RESET.
In present embodiment, the implementation of integral unit 210-1 to 210-n is all identical.For example, integral unit 210-1 comprises operational amplifier 211, back coupling interrupteur SW fb, the 3rd interrupteur SW 3, the 4th interrupteur SW 4 and feedbacks capacitor C fb.Operational amplifier 211 has first input end, the second input and output.In integral unit 210-1, the first input end of operational amplifier 211 couples article one sense wire of contact panel 110, and the second input of operational amplifier 211 receives the second reference voltage V
RefIn the present embodiment, the first input end of operational amplifier 211 is inverting input (inverting input), and the second input of operational amplifier 211 is non-inverting input (non-inverting input).In addition, using the present embodiment person can look its design requirement and determine the first reference voltage V
Ref1With the second reference voltage V
RefAccurate position.For example, with the first reference voltage V
Ref1With/or the second reference voltage V
RefBe set as the accurate position of system voltage VDDA half (being VDDA/2), or be set as band gap voltage (band-gap voltage), or be set as+5V, or be set as other fixed voltages.In present embodiment, the second reference voltage V
RefThe transition in the scope of 0V to 5V (as shown in Figure 3) according to reset signal RESET.
First input end and output that the first end of back coupling interrupteur SW fb and the second end are coupled to respectively operational amplifier 211.The first end of the 3rd interrupteur SW 3 is coupled to the first input end of operational amplifier 211, and the second end of the 3rd interrupteur SW 3 is coupled to the first end of feedbacking capacitor C fb.The first end of the 4th interrupteur SW 4 is coupled to the output of operational amplifier 211, and the second end of the 4th interrupteur SW 4 is coupled to second end of feedbacking capacitor C fb.
The first end of back coupling capacitor C fb is coupled to the second end of the first interrupteur SW 1, and the second end of back coupling capacitor C fb is coupled to the second end of second switch SW2.Therefore, the less back coupling capacitor C fb in integral unit 210-1 to 210-n inside is parallel with one another and to form a large equivalent capacity (be n * Cfb).This large equivalent capacity can use sequentially in turn integral unit 210-1 to 210-n, therefore can avoid the output of integral unit 210-1 to 210-n to reach capacity.So the back coupling capacitor C fb in the integral unit 210-1 to 210-n can be designed to less capacitance, and then significantly reduce the shared chip area of integrator of a plurality of passages.The port number n of Muti-channel integrator 200 is larger, and the effect of saving chip area is more remarkable.Below will describe integral unit 210-1 to 210-n in detail and how use in turn this large equivalent capacity (being the back coupling capacitor C fb in the integral unit 210-1 to 210-n).
Fig. 3 is the control sequential according to each switch in the embodiment of the invention key diagram 2.Please be simultaneously with reference to Fig. 2 and Fig. 3, when system when power supply is just during logical (power on), or system is during reset (reset), system can be made as reset signal RESET activation (enable) state (for example being the logic low level).The first interrupteur SW 1 is controlled by signal RESETB with second switch SW2, and wherein signal RESETB is the inversion signal of reset signal RESET.When reset signal RESET is the logic low level (signal RESETB is set as the logic high levle), the first interrupteur SW 1 is conducting with second switch SW2, the 3rd interrupteur SW 3 in all integral unit 210-1 to 210-n and the 4th interrupteur SW 4 all are cut-off, and the back coupling interrupteur SW fb in all integral unit 210-1 to 210-n all is conducting.
During T1, system can be made as reset signal RESET anergy (disable) state (for example be the logic high levle, namely signal RESETB is set as the logic low level), as shown in Figure 3 during entering first passage.T1 during first passage, control signal S1 can respond reset signal RESET and transition is the logic high levle, and other control signals S2～Sn then maintains the logic low level.Control signal S1 ' is the inversion signal of control signal S1 among Fig. 2, and control signal Sn ' then is the inversion signal of control signal Sn.Therefore, T1 during first passage, the first interrupteur SW 1 is cut-off with second switch SW2, the 3rd interrupteur SW 3 of first integral unit 210-1 and the 4th interrupteur SW 4 are that conducting and its back coupling interrupteur SW fb are cut-off.Therefore, integral unit 210-1 can use the back coupling capacitor C fb of integral unit 210-1 to 210-n by T1 during first passage, and avoids output to reach capacity.At the same time, the 3rd interrupteur SW 3 of other integral units (for example integral unit 210-n) and the 4th interrupteur SW 4 are that cut-off and its back coupling interrupteur SW fb are conducting.Therefore, other integral units 210-2～210-n T1 during first passage is set to unit gain (unit-gain) configuration.
When (for example T1 during the first passage) during the present passage finishes but during not yet entering next passage when (for example T2 during the second channel) (during being equivalent to reset), system can be made as reset signal RESET the logic low level, as shown in Figure 3, this moment, control signal S1 can respond reset signal RESET and transition is the logic low level.During this period, the first interrupteur SW 1 is conducting with second switch SW2, and the 3rd interrupteur SW 3 in the integral unit 210-1 to 210-n and the 4th interrupteur SW 4 all are cut-off, and the back coupling interrupteur SW fb in the integral unit 210-1 to 210-n all is conducting.Therefore, all integral unit 210-1～210-n are set to the unit gain configuration, and two terminal potentials of all integral unit 210-1～210-n self feedback capacitor C fb can be reset be the first reference voltage V
Ref1
After back coupling capacitor C fb in all integral unit 210-1～210-n finishes the operation of resetting, then enter T2 during the second channel.T2 during second channel, control signal S2 can respond reset signal RESET and transition is the logic high levle, and other control signals S1, S3～Sn then maintain the logic low level.Therefore, second integral unit (Fig. 2 is not shown, related description that can integral unit 210-1 and analogize it) can use the back coupling capacitor C fb of integral unit 210-1 to 210-n by T2 during second channel, and avoids output to reach capacity.T2 is set to the unit gain configuration to other integral units (for example integral unit 210-1 and 210-n) during second channel.By that analogy, during Tn, n integral unit 210-n can use the back coupling capacitor C fb of integral unit 210-1 to 210-n during entering the n passage, and avoids output to reach capacity.Tn is set to the unit gain configuration to other integral units (for example integral unit 210-1) during the n passage.T3 during T2, the third channel during the second channel ..., the detailed operation of Tn can be with reference to the related description of T1 during the first passage, so repeat no more during the n passage.
Fig. 4 is the circuit diagram that another kind of Muti-channel integrator is described according to the embodiment of the invention.This Muti-channel integrator 400 has n passage, integral unit of each self-configuring of each passage.The integral unit 410-1 of first passage and the integral unit 410-n of n passage only are shown among the figure, and other passages can be analogized it with reference to following explanation.In addition, Muti-channel integrator 400 still has the first interrupteur SW 1, second switch SW2 and feedbacks capacitor C fb.The first interrupteur SW 1 all receives the first reference voltage V with the first end of second switch SW2
Ref1First end and the second end of back coupling capacitor C fb are coupled to respectively the second end of the first interrupteur SW 1 and the second end of second switch SW2.
In present embodiment, the implementation of integral unit 410-1 to 410-n is all identical.For example, integral unit 410-1 comprises operational amplifier 411, back coupling interrupteur SW fb, the 3rd interrupteur SW 3 and the 4th interrupteur SW 4.Operational amplifier 411 has first input end, the second input and output.In integral unit 410-1, the first input end of operational amplifier 411 couples article one sense wire of contact panel 110, and the second input of operational amplifier 411 receives the second reference voltage V
RefAt this, the first input end of operational amplifier 411 is inverting input, and the second input of operational amplifier 411 is non-inverting input.In addition, using the present embodiment person can look its design requirement and determine the first reference voltage V
Ref1With the second reference voltage V
RefAccurate position.To set the first reference voltage V at this
Ref1Be fixed voltage, for example with the first reference voltage V
Ref1Be set as earthed voltage (being 0V).The second reference voltage V
RefThe transition in the scope of 0V to 5V (as shown in Figure 3) according to reset signal RESET.
First input end and output that the first end of back coupling interrupteur SW fb and the second end are coupled to respectively operational amplifier 411.The first end of the 3rd interrupteur SW 3 is coupled to the first input end of operational amplifier 411, and the second end of the 3rd interrupteur SW 3 is coupled to the first end of feedbacking capacitor C fb.The first end of the 4th interrupteur SW 4 is coupled to the output of operational amplifier 411, and the second end of the 4th interrupteur SW 4 is coupled to second end of feedbacking capacitor C fb.By the control to integral unit 410-1 to 410-n internal switch SW3, SW4 and SWfb, so that integral unit 410-1 to 410-n can sequentially use back coupling capacitor C fb in turn.If the port number n of Muti-channel integrator 400 is larger, the effect of saving chip area is more remarkable.Below will describe integral unit 410-1 to 410-n in detail and how use in turn back coupling capacitor C fb.
The first interrupteur SW 1 is controlled by signal RESETB with second switch SW2, and wherein signal RESETB is the inversion signal of reset signal RESET.Please be simultaneously with reference to Fig. 3 and Fig. 4, when system is during power supply is just logical, or system is during resetting, and system can be made as reset signal RESET enabled status (be logic low level in this hypothesis, namely signal RESETB is set as the logic high levle).During this period, the first interrupteur SW 1 and second switch SW2 are conducting and will feedback capacitor C fb both end voltage and reset to reference voltage V
Ref1During this period, the 3rd interrupteur SW 3 in all integral unit 410-1 to 410-n and the 4th interrupteur SW 4 all are cut-off, and the back coupling interrupteur SW fb in all integral unit 210-1 to 210-n all is conducting.Therefore, reset signal RESET be set as the logic low level during, all integral unit 410-1 to 410-n all are set to the unit gain configuration.
During T1, system can be made as reset signal RESET disabled state (for example be the logic high levle, namely signal RESETB is set as the logic low level), as shown in Figure 3 during entering first passage.T1 during first passage, control signal S1 can respond reset signal RESET and transition is the logic high levle, and other control signals S2～Sn then maintains the logic low level.Control signal S1 ' is the inversion signal of control signal S1 among Fig. 4, and control signal Sn ' then is the inversion signal of control signal Sn.Therefore, T1 during first passage, the first interrupteur SW 1 is cut-off with second switch SW2, the 3rd interrupteur SW 3 of first integral unit 410-1 and the 4th interrupteur SW 4 are conducting, and the back coupling interrupteur SW fb of first integral unit 410-1 is cut-off.Therefore, integral unit 410-1 can use back coupling capacitor C fb by T1 during first passage.At the same time, the 3rd interrupteur SW 3 of other integral units (for example integral unit 410-n) and the 4th interrupteur SW 4 are cut-off, and the back coupling interrupteur SW fb of other integral units (for example integral unit 410-n) is conducting.Therefore, except integral unit 410-1, other integral units T1 during first passage is set to the unit gain configuration.
When T1 during the first passage finishes but during not yet entering second channel during T2 (during being equivalent to reset), system can be made as reset signal RESET logic low level (as shown in Figure 3), and this moment, control signal S1 can respond reset signal RESET and transition is the logic low level.During this period, the first interrupteur SW 1 is conducting with second switch SW2, and the 3rd interrupteur SW 3 in the integral unit 410-1 to 410-n and the 4th interrupteur SW 4 all are cut-off, and the back coupling interrupteur SW fb in the integral unit 410-1 to 410-n all is conducting.Therefore, all integral unit 410-1～410-n are set to the unit gain configuration, and to feedback that two terminal potentials of capacitor C fb can be reset be the first reference voltage V
Ref1
Feedbacking after capacitor C fb finishes the operation of resetting, then entering T2 during the second channel.T2 during second channel, control signal S2 can respond reset signal RESET and transition is the logic high levle, and other control signals S1, S3～Sn then maintain the logic low level.Therefore, second integral unit (Fig. 4 is not shown, related description that can integral unit 410-1 and analogize it) can be during second channel T2 use and feedback capacitor C fb.T2 is set to the unit gain configuration to other integral units (for example integral unit 410-1 and 410-n) during second channel.By that analogy, during entering the n passage during Tn, n integral unit 410-n can use and feedback capacitor C fb.Tn is set to the unit gain configuration to other integral units (for example integral unit 410-1) during the n passage.T3 during T2, the third channel during the second channel ..., the detailed operation of Tn can be with reference to the related description of T1 during the first passage, so repeat no more during the n passage.
In sum, therefore above-described embodiment can significantly reduce the shared chip area of integrator of these passages by sharing in turn one group (or one) back coupling electric capacity between a plurality of passages, and then saves cost.
Although the present invention discloses as above with embodiment; yet it is not to limit the present invention; any those skilled in the art are in the situation that does not break away from the spirit and scope of the present invention; can carry out various modifications and changes to the present invention, so protection scope of the present invention should be defined by appended claims.
Claims (16)
1. Muti-channel integrator comprises:
One first switch, its first end receive one first reference voltage;
One second switch, its first end receive described the first reference voltage; And
A plurality of integral units, wherein each integral unit includes:
One operational amplifier has a first input end, one second input and an output, and wherein said the second input receives one second reference voltage;
One back coupling switch, its first end and the second end are coupled to respectively first input end and the output of described operational amplifier;
One the 3rd switch, its first end is coupled to the first input end of described operational amplifier;
One the 4th switch, its first end is coupled to the output of described operational amplifier; And
One back coupling electric capacity, its first end is coupled to the second end of described the first switch and the second end of described the 3rd switch, and the second end of described back coupling electric capacity is coupled to the second end of described second switch and the second end of described the 4th switch.
2. Muti-channel integrator as claimed in claim 1, wherein when during a power supply is just logical, described the first switch and described second switch are conducting, this 3rd switch and this 4th switch are to end, and this back coupling switch is conducting.
3. Muti-channel integrator as claimed in claim 1, wherein when during one resets, described the first switch and described second switch are conducting, this 3rd switch and this 4th switch are to end, and described back coupling switch is conducting.
4. Muti-channel integrator as claimed in claim 1, in the time of wherein during the passage in during a plurality of passages, described the first switch and described second switch are cut-off, the 3rd switch of a corresponding integral unit and the 4th switch are that conducting and its back coupling switch are cut-off in this integral unit, and the 3rd switch and the 4th switch of other integral units is that cut-off and its back coupling switch are conducting in this integral unit.
5. Muti-channel integrator as claimed in claim 1, in the time of wherein when finishing during the present passage but during not yet entering next passage, described the first switch and described second switch are conducting, and the 3rd switch of this integral unit and the 4th switch are that cut-off and its back coupling switch are conducting.
6. Muti-channel integrator as claimed in claim 1, wherein the first input end of this operational amplifier is inverting input, and the second input of this operational amplifier is non-inverting input.
7. Muti-channel integrator as claimed in claim 1, wherein said the first reference voltage equals described the second reference voltage.
8. Muti-channel integrator as claimed in claim 1, wherein the first input end of operational amplifier is coupled to respectively sense wire corresponding in the contact panel described in this integral unit.
9. Muti-channel integrator comprises:
One first switch, its first end receive one first reference voltage;
One second switch, its first end receive described the first reference voltage;
One back coupling electric capacity, its first end and the second end are coupled to respectively the second end of described the first switch and the second end of described second switch; And
A plurality of integral units, wherein each integral unit includes:
One operational amplifier has a first input end, one second input and an output, and wherein said the second input receives one second reference voltage;
One back coupling switch, its first end and the second end are coupled to respectively first input end and the output of described operational amplifier;
One the 3rd switch, its first end is coupled to the first input end of described operational amplifier, and the second end of described the 3rd switch is coupled to the first end of described back coupling electric capacity; And
One the 4th switch, its first end is coupled to the output of described operational amplifier, and the second end of described the 4th switch is coupled to the second end of described back coupling electric capacity.
10. Muti-channel integrator as claimed in claim 9, wherein when during a power supply is just logical, described the first switch and described second switch are conducting, this 3rd switch and this 4th switch are to end, and described back coupling switch is conducting.
11. Muti-channel integrator as claimed in claim 9, wherein when during one resets, described the first switch and described second switch are conducting, and this 3rd switch and this 4th switch are to end, and described back coupling switch is conducting.
12. Muti-channel integrator as claimed in claim 9, in the time of wherein during the passage in during a plurality of passages, described the first switch and described second switch are cut-off, the 3rd switch of a corresponding integral unit and the 4th switch are that conducting and its back coupling switch are cut-off in this integral unit, and the 3rd switch and the 4th switch of other integral units is that cut-off and its back coupling switch are conducting in this integral unit.
13. Muti-channel integrator as claimed in claim 9, in the time of wherein when finishing during the present passage but during not yet entering next passage, described the first switch and described second switch are conducting, and the 3rd switch of this integral unit and the 4th switch are that cut-off and its back coupling switch are conducting.
14. Muti-channel integrator as claimed in claim 9, wherein the first input end of this operational amplifier is inverting input, and the second input of described operational amplifier is non-inverting input.
15. Muti-channel integrator as claimed in claim 9, wherein said the first reference voltage equals described the second reference voltage.
16. Muti-channel integrator as claimed in claim 9, wherein the first input end of operational amplifier is coupled to respectively sense wire corresponding in the contact panel described in this integral unit.
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| US5281860A (en) * | 1991-07-26 | 1994-01-25 | Texas Instruments Incorporated | Method and apparatus for an improved multiple channel sensor interface circuit |
| US5548122A (en) * | 1993-09-01 | 1996-08-20 | Fuji Photo Film Co., Ltd. | Radiation detector |
| CN101101525A (en) * | 2007-08-08 | 2008-01-09 | 友达光电股份有限公司 | Touching control panel |
| CN101510132A (en) * | 2008-02-13 | 2009-08-19 | 奇景光电股份有限公司 | Sensor pixel and touch panel thereof |
| CN101556297A (en) * | 2008-04-08 | 2009-10-14 | 瑞鼎科技股份有限公司 | Capacitance value measuring circuit and measuring method thereof |
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