CN104348489A - Feed-forward type trigonometric integral modulator - Google Patents
Feed-forward type trigonometric integral modulator Download PDFInfo
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- CN104348489A CN104348489A CN201310320233.5A CN201310320233A CN104348489A CN 104348489 A CN104348489 A CN 104348489A CN 201310320233 A CN201310320233 A CN 201310320233A CN 104348489 A CN104348489 A CN 104348489A
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Abstract
Provided is a feed-forward type trigonometric integral modulator which comprises a successive approximation type analog-digital converter, a digital-analog converter, N integrators, a first adder, a second adder and an optimal zero point generation unit, wherein N is a positive integer. The output end of each integrator of the N integrators is coupled with the successive approximation type analog-digital converter. The digital-analog converter is coupled between the first adder and the successive approximation type analog-digital converter. The first adder is coupled with the input end of the first integrator of the N integrators. The second adder is coupled with the input end of the Kth integrator of the N integrators, wherein K is the positive integer which is less than N. The optimal zero point generation unit is coupled between the second adder and the output end of the (K+1)th integrator of the N integrators.
Description
Technical field
The present invention relates to a kind of feed forward type triangular integration modulator (feedforward delta-sigma modulator), espespecially a kind of feed forward type triangular integration modulator realizing adder functions in charge-domain (charge domain).
Background technology
When feed-forward type triangular integration modulator is when realizing adder in voltage domain (voltage domain), feed-forward type triangular integration modulator because use extra operational amplifier, and can add power consumption.In addition, because the limited frequency range of operational amplifier can cause unnecessary loop delay time (excess loop delay, ELD), so reduce the performance of triangular integration modulator.
When feed-forward type triangular integration modulator is when realizing adder in current domain (current domain), because trnasducing element needs enough linear (linear) just can not reduce the linearity of delta sigma modulator, so add the chip area of triangular integration modulator, power consumption and complexity.
When feed-forward type triangular integration modulator utilizes the integrating capacitor ratio of feed-forward capacitance and afterbody integrator to realize feed-forward coefficients, because require that lower integral electric capacity is usually very large at low noise, so feed-forward capacitance also and then becomes large, feed-forward type triangular integration modulator is caused to consume larger chip area.In addition, feed-forward capacitance can increase the power consumption of the operational amplifier of feed-forward type triangular integration modulator.
Another kind of feed forward type triangular integration modulator is the comparator utilizing a multi input, and by direct for each forward path input comparator, wherein the size of the input transistors of feed forward type triangular integration modulator is used for realizing feed-forward coefficients.But the shortcoming with the feed forward type triangular integration modulator of the comparator of multi input is that each feed-forward coefficients is responsive to the common-mode voltage of corresponding integrator output terminal, so when the common mode output voltage of the integrator of feed forward type triangular integration modulator is inconsistent, the feed-forward coefficients of feed forward type triangular integration modulator has very large skew.
In addition, because the time of delay of quantizer and analog-digital converter (delay time) can cause the usefulness of triangular integration modulator to decline, even make the loop of triangular integration modulator unstable, so prior art adds that between quantizer input with the output of triangular integration modulator an extra digital analog converter compensates.But extra digital analog converter can increase chip area and the power consumption of triangular integration modulator.
Therefore, for user, the feed-forward type triangular integration modulator that prior art provides is not good selection.
Summary of the invention
Because the problem of above-mentioned prior art, the invention provides a kind of feed forward type triangular integration modulator.This feed forward type triangular integration modulator is the adder functions realizing needed for feed forward type triangular integration modulator in charge-domain (charge domain), to solve the problem of above-mentioned prior art.
One embodiment of the invention provide a kind of feed forward type triangular integration modulator.This feed forward type triangular integration modulator comprises successive approximation analog-digital converter, digital analog converter, N number of integrator, first adder, second adder and the best generation unit at zero point.This successive approximation analog-digital converter comprises N+1 input, and is used for the output of output digit signals, and the input wherein in this N+1 input is used for receiving analog input signal, and N is positive integer; This digital analog converter is coupled to the output of this successive approximation analog-digital converter, is used for receiving this digital signal, and produces analog feedback signal according to this; The output of each integrator in this N number of integrator couples the corresponding input in this N+1 input; This first adder is coupled to this digital analog converter, is used for adding up this analog input signal with this analog feedback signal to the first integrator in this N number of integrator; This second adder is coupled to the input of the K integrator in this N number of integrator, and wherein the output of this K integrator is coupled to the input of the K+1 integrator of this N number of integrator, and K is the positive integer being less than N; This best generation unit at zero point is coupled between this second adder and output of this K+1 integrator.
Compared to prior art, the present invention has following advantages: the first, the present invention is the adder functions realizing needed for feed forward type triangular integration modulator in charge-domain, so the present invention does not need extra operational amplifier and transduction amplifier, the present invention is caused to have less chip area, lower power consumption and lower complexity; The second, the capacitance of the sampling capacitance of this feed forward type triangular integration modulator only has nothing to do with the integrating capacitor in the integrator of this feed forward type triangular integration modulator about (namely the capacitance of the sampling capacitance of this feed forward type triangular integration modulator is only proportional with the capacitance of this reference capacitance) with the capacitance of reference capacitance, so the capacitance of the sampling capacitance of this feed forward type triangular integration modulator can be very little, the power consumption of operational amplifier in the integrator of this feed forward type triangular integration modulator is caused to reduce; Three, the amplitude of this feed forward type triangular integration modulator to the output common mode voltage of each integrator, the output voltage of each integrator and analog input signal is insensitive, so feed forward type triangular integration modulator is applicable at a high speed, the application of high-resolution and low power consumption.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that a kind of feed forward type triangular integration modulator is described.
Fig. 2 is the schematic diagram that one embodiment of the invention illustrate successive approximation analog-digital converter.
Fig. 3 is the time sequential routine schematic diagram that successive approximation analog-digital converter 102 is described.
Description of reference numerals
100 feed forward type triangular integration modulator 102 successive approximation analog-digital converters
104 digital analog converter 108 first adders
110 second adders 112 generation unit at best zero point
1028 reference voltage generation unit 1030 reference voltage switch units
1032 comparator 1034 common mode switch
1036 successive approximation logic control element 1061-1063 integrators
10221-10224 switch element AIS analog input signal
AFS analog feedback signal Cr reference capacitance
CT common mode terminal CS comparison signal
CK frequency DS digital signal
F1C-f4C sampling capacitance SS strobe signal
V2-V4 output voltage Φ s sampled signal
Φ sa common mode switch signal
Φ L1, Φ L2, Φ L3, Φ L4, Φ L5 control signal
Φ h maintains signal
Embodiment
Please refer to Fig. 1, Fig. 1 is the schematic diagram that a kind of feed forward type triangular integration modulator (feedforward delta-sigma modulator) 100 is described.As shown in Figure 1, feed forward type triangular integration modulator 100 comprises successive approximation analog-digital converter (successive approximation Analog-to-Digital Converter) 102, digital analog converter 104,3 integrator 1061-1063, first adder 108, second adder 110 and the best generation unit at zero point 112.But the present invention is not limited to feed forward type triangular integration modulator 100 comprises 3 integrator 1061-1063.Successive approximation analog-digital converter 102 comprises 4 inputs, and is used for the output of output digit signals DS, and the input in 4 inputs of wherein successive approximation analog-digital converter 102 is used for receiving analog input signal AIS.Digital analog converter 104 is coupled to the output of successive approximation analog-digital converter 102, is used for receiving digital signals DS, and produces analog feedback signal AFS according to this.The output of each integrator in 3 integrator 1061-1063 couples the input of corresponding input in 4 inputs of successive approximation analog-digital converter 102 and next integrator.Such as, the output of integrator 1061 couples the input of corresponding input in 4 inputs of successive approximation analog-digital converter 102 and integrator 1062.First adder 108 is coupled to digital analog converter 104 sum-product intergrator 1061, is used for adding up analog input signal AIS and analog feedback signal AFS to integrator 1061.Second adder 110 is coupled between sum-product intergrator 1061 and sum-product intergrator 1062.But the present invention is not limited to second adder 110 to be coupled between integrator 1061 and sum-product intergrator 1062, namely second adder 110 can be coupled between wantonly two integrators in 3 integrator 1061-1063.The best generation unit at zero point 112 is coupled between the output of second adder 110 and integrator 1063, is used for producing zero point to suppress the noise of feed forward type triangular integration modulator 100.But the present invention is not limited to best zero point generation unit and 112 is coupled between the output of second adder 110 and integrator 1063, between the input that namely best zero point, generation unit 112 can be coupled to an integrator of wantonly two adjacent integrators and the output of another integrator.
Please refer to Fig. 2, Fig. 2 is the schematic diagram that one embodiment of the invention illustrate successive approximation analog-digital converter 102.As shown in Figure 2, successive approximation analog-digital converter 102 comprises 4 switch element 10221-10224,4 sampling capacitance f1C-f4C, reference capacitance Cr, reference voltage generation unit 1028, reference voltage switch unit 1030, comparator 1032, common mode switch 1034 and successive approximation logic control elements 1036.First switch element 10221 of 4 switch element 10221-10224 is coupled between the input of first adder 108 and first sampling capacitance 10241 of 4 sampling capacitance f1C-f4C, each switch element in the rest switch unit of 4 switch element 10221-10224 is coupled between the output of each integrator in 3 integrator 1061-1063 and the corresponding sampling capacitance of 4 sampling capacitance f1C-f4C, and the capacitance of 4 sampling capacitance f1C-f4C is proportional mutually.Such as, switch element 10222 is coupled between the output of integrator 1061 and corresponding sampling capacitance 10242.Reference voltage generation unit 1028 is used for producing multiple reference voltage.Reference voltage switch unit 1030 comprises multiple switch, and reference voltage switch unit 1030 is coupled to reference voltage generation unit 1028, reference capacitance Cr and common mode terminal CT, wherein multiple switch receives the reference voltage in the common-mode voltage of common mode terminal CT or multiple reference voltage with the first end deciding reference capacitance Cr.Comparator 1032 comprises: first input end, is coupled to 4 sampling capacitance f1C-f4C and reference capacitance Cr; Second input, is coupled to common mode terminal CT; 3rd input, is used for receiving strobe signal SS; And output, be used for exporting comparison signal CS.Common mode switch 1034 comprises: first end, is coupled to 4 sampling capacitance f1C-f4C and reference capacitance Cr; And second end, be coupled to common mode terminal CT, successive approximation logic control element 1036 comprises: first input end, is used for receive frequency CK; Second input, is used for receiving comparison signal CS; First output, is used for exporting strobe signal SS; Second output, is used for exporting control signal; And the 3rd output, be used for output digit signals DS.
Please refer to Fig. 3, Fig. 3 is the schematic diagram in the time sequential routine that successive approximation analog-digital converter 102 is described.Feed forward type triangular integration modulator 100 utilizes principle of charge conservation, reaches charge-domain (charge domain) addition by electric charge redistribution (charge-redistribution).In addition, feed forward type triangular integration modulator 100 utilizes the ratio of the capacitance of sampling capacitance f1C-f4C and reference capacitance Cr to realize feed-forward coefficients f1-f4.
During sampled signal Φ s, common mode switch 1034 receives common mode switch signal Phi sa, so common mode switch 1034 is opened, causes second end of sampling capacitance f1C-f4C and second termination of reference capacitance Cr to receive the common-mode voltage of common mode terminal CT.Namely second end of sampling capacitance f1C-f4C and second end of reference capacitance Cr are reset.When 4 switch element 10221-10224 receive sampled signal Φ s (sampling interval as shown in Figure 3), the first end of sampling capacitance f1C-f4C is sampled to the output voltage V2-V4 of the output of analog input signal AIS and 3 integrator 1061-1063 respectively.During sampled signal Φ s, the digital signal that successive approximation logic control element 1036 exported according to feed forward type triangular integration modulator 100 last time, produces the control signal Φ L1 to reference voltage switch unit 1030.Therefore, reference voltage switch unit 1030 can according to control signal Φ L1, the corresponding reference voltage in multiple reference voltages that the first end reception reference voltage generation unit 1028 switching reference capacitance Cr produces.So, feed forward type triangular integration modulator 100 just can complete delay compensation (Excess Loop Delay Compensation), and does not need the extra digital analog converter needed for prior art to do delay compensation.
When 4 switch element 10221-10224 receive maintenance signal Phi h (maintenance is as shown in Figure 3 interval), the first end of sampling capacitance f1C-f4C receives the common-mode voltage of common mode terminal CT, so the output voltage V2-V4 of the output of analog input signal AIS and 3 integrator 1061-1063 that sampling capacitance f1C-f4C samples during sampled signal Φ s can be passed to second end of sampling capacitance f1C-f4C.Now, successive approximation logic control element 1036 produces the control signal Φ L2 to reference voltage switch unit 1030.Therefore, reference voltage switch unit 1030 can according to control signal Φ L2, the first end switching reference capacitance Cr receives the common-mode voltage of common mode terminal CT, so the corresponding reference voltage that reference capacitance Cr receives during sampled signal Φ s also can be passed to second end of reference capacitance Cr.So, the electric charge of the electric charge of second end of reference capacitance Cr and second end of sampling capacitance f1C-f4C can be redistributed.
After control signal Φ L2 produces, successive approximation logic control element 1036 is according to frequency CK, produce strobe signal SS to drive comparator 1032 and produce to control signal Φ L3, the Φ L4 of reference voltage switch unit 1030, Φ L5 ... so reference voltage switch unit 1030 can according to control signal Φ L3, Φ L4, Φ L5 ..., the corresponding reference voltage in multiple reference voltages that the first end reception reference voltage generation unit 1028 switching reference capacitance Cr produces.Therefore, when receiving the corresponding reference voltage in multiple reference voltages that reference voltage generation unit 1028 produces when the first end switching reference capacitance Cr at every turn, the electric charge of the electric charge of second end of reference capacitance Cr and second end of sampling capacitance f1C-f4C can be redistributed again, to produce corresponding voltage.Now, comparator 1032 according to the common-mode voltage of corresponding voltage and common mode terminal CT, can complete the operation of traditional successive approximation Analog-digital Converter.
In addition, above-described embodiment only utilizes single-ended operation that the present invention is described.That is, the present invention is not limited to single-ended (single-ended) or differential (differential) operation.
In sum, compared to prior art, feed forward type triangular integration modulator provided by the present invention has following advantages: the first, the present invention is the adder functions realizing needed for feed forward type triangular integration modulator in charge-domain, so the present invention does not need extra operational amplifier and transduction amplifier, the present invention is caused to have less chip area, lower power consumption and lower complexity; The second, the capacitance of the sampling capacitance of feed forward type triangular integration modulator only relevant with the capacitance of reference capacitance (namely, the capacitance of sampling capacitance is only proportional with the capacitance of reference capacitance) and have nothing to do with the integrating capacitor in integrator, so the capacitance of sampling capacitance can be very little, the power consumption of operational amplifier in integrator is caused to reduce; Three, the amplitude of the present invention to the output common mode voltage of each integrator, the output voltage of each integrator and analog input signal is insensitive, so the present invention is applicable at a high speed, the application of high-resolution and low power consumption.
Claims (7)
1. a feed forward type triangular integration modulator, comprising:
Successive approximation analog-digital converter, comprise N+1 input and be used for the output of output digit signals, the input wherein in this N+1 input is used for receiving analog input signal, and N is positive integer;
Digital analog converter, is coupled to the output of this successive approximation analog-digital converter, is used for receiving this digital signal, and produces analog feedback signal according to this;
N number of integrator, wherein the output of each integrator couples the corresponding input in this N+1 input;
First adder, is coupled to this digital analog converter, is used for adding up this analog input signal with this analog feedback signal to the first integrator in this N number of integrator;
Second adder, be coupled to the input of the K integrator in this N number of integrator, wherein the output of this K integrator is coupled to the input of the K+1 integrator in this N number of integrator, and K is the positive integer being less than N; And
The best generation unit at zero point, is coupled between this second adder and output of this K+1 integrator.
2. feed forward type triangular integration modulator as claimed in claim 1, wherein this successive approximation analog-digital converter comprises:
N+1 switch element;
N+1 sampling capacitance, wherein the first switch element of this N+1 switch element is coupled between the input of this first adder and the first sampling capacitance of this N+1 sampling capacitance, and each switch element in the rest switch unit of this N+1 switch element is coupled between the output of each integrator in this N number of integrator and the corresponding sampling capacitance of this N+1 sampling capacitance;
Reference capacitance, wherein the capacitance of this N+1 sampling capacitance and this reference capacitance is proportional mutually;
Reference voltage generation unit, is used for producing multiple reference voltage;
Reference voltage switch unit, comprise multiple switch, this reference voltage switch unit is coupled to this reference voltage generation unit, this reference capacitance and common mode terminal, and wherein said multiple switch first end deciding this reference capacitance receives the reference voltage in the common-mode voltage of this common mode terminal or described multiple reference voltage;
Comparator, comprising: first input end, is coupled to this N+1 sampling capacitance and this reference capacitance; Second input, is coupled to this common mode terminal; 3rd input, is used for receiving strobe signal; And be used for exporting the output of comparison signal;
Common mode switch, comprises the first end being coupled to this N+1 sampling capacitance and this reference capacitance and the second end being coupled to this common mode terminal; And
Successive approximation logic control element, comprising: first input end, is used for receive frequency; Second input, is used for receiving this comparison signal; First output, is used for exporting this strobe signal; Second output, is used for exporting control signal; And the 3rd output, be used for exporting this digital signal.
3. feed forward type triangular integration modulator as claimed in claim 2, wherein when this first switch element receives sampled signal, the first end of this first sampling capacitance is sampled to this analog input signal, when this switch element receives this sampled signal, the first end of this corresponding sampling capacitance is sampled to the output voltage of the output of this integrator, and during this sampled signal, this successive approximation logic control element controls this reference voltage switch unit according to this control signal, to switch this reference capacitance receiving corresponding reference voltage in the plurality of reference voltage, wherein this corresponding reference voltage is relevant with digital signal once exported before this successive approximation logic control element.
4. feed forward type triangular integration modulator as claimed in claim 2, wherein when this switch element receives maintenance signal, the first end of this corresponding sampling capacitance receives this common-mode voltage, when this first switch element receives this maintenance signal, the first end of this first sampling capacitance receives this common-mode voltage, and in the beginning of this maintenance signal, this successive approximation logic control element controls this reference voltage switch unit according to this control signal, so that the first end switching this reference capacitance receives this common-mode voltage.
5. feed forward type triangular integration modulator as claimed in claim 4, wherein when the first end of this corresponding sampling capacitance receives this common-mode voltage, this corresponding sampling capacitance transmits second end of output voltage to this corresponding sampling capacitance of the output of this integrator, and when the first end of this first sampling capacitance receives this common-mode voltage, this first sampling capacitance transmits second end of this analog input signal to this first sampling capacitance.
6. feed forward type triangular integration modulator as claimed in claim 4, wherein during this maintenance signal and after the first end of this reference capacitance receives this common-mode voltage, this successive approximation logic control element controls this reference voltage switch unit according to this control signal, makes this reference capacitance receive corresponding reference voltage in the plurality of reference voltage.
7. feed forward type triangular integration modulator as claimed in claim 2, wherein during ㄧ sampled signal, this common mode switch opens (ON), and the second end of this N+1 sampling capacitance and the second end of this reference capacitance couple this common mode terminal.
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