Charge pump circuit with source-sink current steering

Details Charge pump circuit with source-sink current steering Charge pump circuit with source-sink current steering

1996-12-16

1998-09-01

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327157, G05F 110

Patent

active

058015787

ABSTRACT:
A charge pump circuit includes a current mirror circuit of current-sourcing and current-sinking FETs and a current steering circuit of cross coupled differential pairs of FETs. Nominal current flowing in the current-sourcing and current-sinking FETs is set. The current is for charging and discharging a capacitor of an external filter. During charging of the capacitor, the current through the current-sourcing FET is directed to the capacitor and the current through the current-sinking FET is directed from a low impedance voltage source. During discharging of the filter capacitor, the current through the current-sourcing FET is directed to the low impedance voltage source and the current through the current-sinking FET is directed from the capacitor. The current flowing in the current-sourcing and current-sinking FETs is nominally constant, regardless of the tri-state condition, charging or discharging, with the result that power supply noise is reduced. Current change in the power supply rails is reduced when switching from current-sourcing to current-sinking or vice versa. By using cascode FETs in both of the current-sourcing and current-sinking FET circuits, power supply noise rejection is improved.

REFERENCES:
patent: 5144156 (1992-09-01), Kawasaki
patent: 5285114 (1994-02-01), Atriss et al.
patent: 5334951 (1994-08-01), Hogeboom
patent: 5592120 (1997-01-01), Palmer et al.
patent: 5734279 (1998-03-01), Bereza
Sedra & Smith, "Microelectronic Circuits", Saunders College Publishing, Philadelphia, Fig. 6.32, 1991.

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