Combining and filter circuit for a phase locked loop

Details Combining and filter circuit for a phase locked loop Combining and filter circuit for a phase locked loop

1980-10-20

1982-12-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

307521, 330303, 331 17, 333171, H03L 708

Patent

active

043630049

ABSTRACT:
A combining and filter circuit is provided to connect the acquisition circuit and phase detector circuit to the voltage controlled oscillator in a phase locked loop. The combining and filter circuit includes twin-T filters for removing reference frequency signals. An output circuit includes series resistors and capacitors, and reverse poled Schottky diodes which provide rapidly changing acquisition signals that are relatively noise free.

REFERENCES:
patent: 3316497 (1967-04-01), Brooks
patent: 3745376 (1973-07-01), McIntosh
patent: 3993958 (1976-11-01), Cutsogeorge
patent: 4131862 (1978-12-01), Black et al.

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