Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1992-09-02
1994-07-19
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 16, 331177R, 331179, 332123, 375118, 455 76, 455119, 455258, H03L 700, H04B 140
Patent
active
053312937
ABSTRACT:
A digital frequency synthesizer circuit with spur compensation includes a demodulator circuit (118) for demodulating the output signal (116) of the synthesizer's accumulator (108). Demodulator (118) also inverts the signal, and provides an inverted demodulated output signal (142) which is then coupled to the synthesizer clock (124) after passing through a gain stage (122) in order to modulate the synthesizer clock (124) with a compensation signal (146). The compensated clock signal (140) is then sent to accumulator (108) in order to substantially cancel out any jitter in the accumulator's output signal (116). The modulation signal (MOD IN) which is digitally applied to accumulator (108) is applied in analog fashion to the gain stage (122) in order to prevent the desired modulation signal (MOD IN) from being canceled in the output signal (116).
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"Communication Circuits: Analysis and Design" by Kenneth K. Clarke and Donald T. Hess, Sep. 198, pp. 615-618. Addison-Wesley.
"Q2334 Dual Direct Digital Synthesizer Technical Data Sheet" Jun. 1991, pp. 1-35 by Qualcomm, Inc. (no author).
Heck Joseph P.
Shepherd Wayne P.
Hernandez Pedro P.
Mis David
Motorola Inc.
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