Phase-locked-loop circuit having a charge pump

Details Phase-locked-loop circuit having a charge pump Phase-locked-loop circuit having a charge pump

1986-10-16

1988-05-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 14, 331 17, 331 25, 331DIG2, H03L 710, H03L 718

Patent

active

047453729

ABSTRACT:
A phase-locked-loop (PLL) circuit comprising a phase comparator, a current-variable charge pump, a voltage-controlled oscillator, a low-pass filter, and frequency dividers. The charge pump drive current is controlled in steps or continuously depending on the operating mode.

REFERENCES:
patent: 3599110 (1971-08-01), Gindi
patent: 4156855 (1979-05-01), Crowley
patent: 4167711 (1979-09-01), Smoot
patent: 4626797 (1986-12-01), Sakata
patent: 4649353 (1987-03-01), Sonnenberg

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