Fast CMOS charge pump circuit

Details Fast CMOS charge pump circuit Fast CMOS charge pump circuit

1993-06-16

1994-11-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 8, 331 25, 327108, 327157, H03L 7089, H03L 7093

Patent

active

053630661

ABSTRACT:
A charge pump circuit for a phase-locked loop circuit which provides substantially constant charge and discharge currents characterized by minimal overshoots and undershoots. The charge pump circuit includes a level shifter circuit which attenuates voltage swings in Up and Down signals from the phase detector and provides control signals. The charge pump circuit also includes a feedback circuit coupled to the level shifter which compares the output voltage of the charge pump to predetermined first and second reference voltages and increases and decreases the charge and discharge currents to minimize overshoot and undershoot noise as determined by the control signals.

REFERENCES:
patent: 5142696 (1992-08-01), Kosiec et al.

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