Wide-deviation tracking filter circuit

Details Wide-deviation tracking filter circuit Wide-deviation tracking filter circuit

1987-12-18

1989-03-21

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 18, 331 30, 331 48, 331172, H03L 706

Patent

active

048147273

ABSTRACT:
A wide deviation tracking filter is provided which has the input signal to be tracked applied to a low frequency phase-locked loop circuit which performs coarse filtering of the phase noise on the input signal. A digital phase shifter is connected in series in the low frequency phase-locked loop and produces a pair of quadrature clock signals which are at the frequency of the input signal and at half the frequency of the output of the voltage control oscillator of the low frequency phase-locked loop. The pair of quadrature signals are connected to an image reject circuit. The image reject circuit is connected in series in the loop of a high frequency phase-locked loop which operates at a much higher frequency than the low frequency phase-locked loop and performs the function of further filtering the phase noise on the input signal to provide an output signal having ultra-low phase noise.

REFERENCES:
patent: 4352074 (1982-09-01), Blinchikoff et al.
patent: 4453137 (1984-06-01), Rittenbach

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