Frequency synthesizer circuit

Details Frequency synthesizer circuit Frequency synthesizer circuit

1986-05-23

1987-11-10

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 25, H03L 708

Patent

active

047060409

ABSTRACT:
In a frequency synthesizer circuit, a phase-locked loop serves to generate an analog signal. The circuit includes a phase comparator, a reference oscillator, an analog low-pass filter, and a voltage-controlled oscillator (VCO). The output of the VCO is the analog signal. The phase comparator is a digital circuit to which the two phases to be compared are furnished as digital signals. One of the phase signals is a signal representative of the phase of the reference oscillator. The second phase signal is derived from an accumulator which is clocked by the VCO and accumulates an adjustable numerical value on receipt of each clock pulse. The content of the accumulator is fed to the phase comparator as the second phase signal. The phase-locked loop synchronizes the accumulator cycle frequency, which is adjustable via the numerical value, with the reference or VCO frequency and thus determines the frequency of the analog signal.

REFERENCES:
patent: 3555446 (1971-01-01), Braymer
patent: 3582810 (1971-06-01), Gillette
patent: 4052673 (1977-10-01), Herzog
patent: 4145667 (1979-03-01), Messerschmitt
patent: 4586005 (1986-04-01), Crawford

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