Circuit for automatic frequency control using a reciprocal direc

Details Circuit for automatic frequency control using a reciprocal direc Circuit for automatic frequency control using a reciprocal direc

1999-10-07

2000-08-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

327105, 327106, 331 18, 331 25, 331 34, 331176, H03L 102, H03L 7099, H03L 718

Patent

active

061042528

ABSTRACT:
A circuit for automatic frequency control includes an oscillator and a digital synthesis device to which a first frequency of the oscillator is supplied as a clock frequency and which generates an output signal having a second frequency. A frequency comparison device determines a frequency difference between the second frequency and a reference frequency and generates a digital output signal reproducing the frequency difference. The digital output signal is then supplied as an addition value to the digital synthesis device. The circuit for automatic frequency control generates a highly accurate and temperature-compensated output signal with the second frequency.

REFERENCES:
patent: 4454483 (1984-06-01), Baylor
patent: 4849993 (1989-07-01), Johnson et al.
patent: 4965533 (1990-10-01), Gilmore
patent: 5028887 (1991-07-01), Gilmore
patent: 5216389 (1993-06-01), Carralero et al.
patent: 5539346 (1996-07-01), Goto

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