Crystal oscillator programmable with frequency-defining parameters

United States Patent

Fallisgaard et al.

[19]

US005952890A [ii] Patent Number: [45] Date of Patent:

5,952,890 Sep. 14,1999

[54] CRYSTAL OSCILLATOR PROGRAMMABLE WITH FREQUENCY-DEFINING PARAMETERS

[75] Inventors: John W. Fallisgaard, Seattle, Wash.;

Eugene S. Trefethan, Fort Myers, Fla.

[73] Assignees: Fox Enterprises, Inc., Fort Myers, Fla.;

Jet City Electronics, Seattle, Wash.

[21] Appl. No.: 08/795,978 [22] Filed: Feb. 5, 1997

[51] Int. CI.6 H03B 5/32; H03L 7/06;

H03L 7/18

[52] U.S. CI 331/18; 331/16; 331/158;

331/179

[58] Field of Search 331/16, 18, 25,

331/116 R, 116 FE, 158, 179; 327/105, 156-159; 375/376; 455/260

[56] References Cited

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A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one ol these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency ol a phase locked loop circuit coupled to receive the adjusted source frequency. A fiirther parameter can also be used to divide the output frequency ol the phase locked loop circuit to supply a specified output frequency. The oscillators can be manulactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree ol accuracy.

33 Claims, 4 Drawing Sheets

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