Voltage controlled oscillator with frequency and phase control l

Details Voltage controlled oscillator with frequency and phase control l Voltage controlled oscillator with frequency and phase control l

1976-06-03

1979-05-22

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, H03B 304

Patent

active

041562046

ABSTRACT:
The inventive synchronization circuit accepts a reference input signal and produces a signal which is in both phase and frequency lock therewith. The reference signal is quadrature detected via a voltage controlled oscillator signal, a quadrature phase shifter and a pair of mixers. A frequency error signal is generated by processing the mixer outputs through a phase detector and integrator. A phase error signal is produced by extracting and combining the DC components of the signals at the mixer outputs. The frequency and phase error signals are summed to produce a control signal which is fed back to the voltage controlled oscillator, thus causing the oscillator signal to tend to lock in frequency and phase with the input reference signal.

REFERENCES:
patent: 2731566 (1956-01-01), Chalhoub
patent: 3456196 (1969-07-01), Schneider

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