Dual-charge-pump bandwidth-switched phase-locked loop

Details Dual-charge-pump bandwidth-switched phase-locked loop Dual-charge-pump bandwidth-switched phase-locked loop

1991-06-28

1992-06-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 10, 331 17, 331 25, 360 371, 360 51, H03L 7093

Patent

active

051210851

ABSTRACT:
Separate charge pumps (58, 60 and 74, 76) drive integral and proportional control paths for a voltage-controlled oscillator (52) in a phase-locked loop (50). A control circuit (74) varies the loop gain of the phase-locked loop by varying the current supplied by the integral-path charge pump (58,60) through a range that is the square of the range through which the current supplied by the proportional-path charge pump (74, 76) is varied. As a consequence, the damping factor of the loop response changes very little as the loop gain is varied through a large range.

REFERENCES:
patent: 4694326 (1987-09-01), Demmer
patent: 4942370 (1990-07-01), Shigemori
Gardner, F. M., "Charge-Pump Phase-Lock Loops", IEEE Trans. on Communications, vol. COM-28, No. 11, Nov. 1980, pp. 1849-1858.

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