Voltage control oscillator which suppresses phase noise caused b

Details Voltage control oscillator which suppresses phase noise caused b Voltage control oscillator which suppresses phase noise caused b

1993-08-02

1994-09-27

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 16, 331 17, 331 18, 331 25, H03L 7085, H03L 716

Patent

active

053510143

ABSTRACT:
A frequency synthesizer is composed of a reference oscillator, the first and the second integrators, a binary adder, a low pass filter and VCO forming a Phase Locked Loop (PLL). The first integrator, driven by the timing of a reference oscillator, integrates an externally supplied value K and generates the input signal. The second integrator, driven by the output signal of the VCO of the PLL, integrates an externally supplied value L. The binary adder detects the difference between the outputs of the first and the second integrators functioning as a phase comparator. The output of the phase comparator is converted into an analog voltage which is filtered to control the VCO to achieve frequency synthesis by the phase lock function of the loop.

REFERENCES:
patent: 3555446 (1971-01-01), Braymer
patent: 3582810 (1971-06-01), Gillette
patent: 4706040 (1987-11-01), Mehrgardt
patent: 4951004 (1990-08-01), Sheffer et al.

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