Frequency synthesizer having digital phase detector with optimal

Details Frequency synthesizer having digital phase detector with optimal Frequency synthesizer having digital phase detector with optimal

1987-11-20

1988-08-16

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331DIG2, 307511, 307514, 307516, 307527, 328133, 328134, H03L 706, H03D 302, H03K 906

Patent

active

047647370

ABSTRACT:
For use in a radio synthesizer (110), a digital phase detector (118) indicates the phase error between a reference signal provided by a reference oscillator (117) and an output frequency signal (114) provided by a voltage controlled oscillator (112). The digital phase detector (118) includes four flip/flops (310, 312, 314 and 316) which receive the frequency signals (116 and 120) provided by the oscillators (117 and 112) to generate steering signals (126) which optimally indicate the phase error between the frequency signals (116 and 120) as well as providing optimal (maximum) frequency steering when a frequency difference between the frequency signals (116 and 120) exists. Responsive to the flip/flops, digital logic circuitry (306) is used to provide a non-integrated level-type indication when the frequency signals (116 and 120) are phase locked.

REFERENCES:
patent: 4122405 (1978-10-01), Tietz et al.
"A Three State Phase Detector Can Improve Your Next PPL Design", by C. A. Sharpe, EDN, Sep. 20, 1976.
"Speed-Up PLLS in Digital Synthesizers", Electronic Design, Nov. 22, 1977, by C. A. Sharpe.
Motorola Publication No. 68P81020E09-0.

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