High speed and low drift charge pump circuit

Details High speed and low drift charge pump circuit High speed and low drift charge pump circuit

1993-01-21

1994-10-25

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 25, 307246, 307597, 307603, H03L 7089, H03L 7093, H03K 1756, H03K 1728

Patent

active

053592999

ABSTRACT:
A device for converting binary logic pulses into an output current and the output current being switchable between a positive and negative polarity. The device provides a charge pump circuit which is suitable for the phase-detector stage in a phase-locked loop (PLL) circuit. The charge pump circuit comprises an input stage for the "UP" binary logic pulses and a second stage for the "DOWN" binary logic pulses. The input stages comprise emitted-coupled transistor pairs. The circuit includes current sources and current sinks for generating the output current in the input stages in response to the binary logic pulses. The circuit features a pair of switch diodes coupled between the outputs of the input stages. The diodes form a commutator which controls the direction of the output current and the leakage current during the idle states. The circuit also includes a clamping circuit to limit the voltage swing across the switching diodes. The charge pump circuit according to the present invention exhibits a fast response time, a symmetrical response to the binary logic pulses, and virtually zero leakage current in the idle state. The charge pump circuit utilizes non-complimentary bipolar processes and is suitable for a monolithic integrated circuit implementation.

REFERENCES:
patent: 5126692 (1992-06-01), Shearer et al.
patent: 5153530 (1992-10-01), Takagi et al.

Affiliated with

Also associated with

Rating

High speed and low drift charge pump circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High speed and low drift charge pump circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High speed and low drift charge pump circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-138138