Dual mode charge pump for automatic gain control circuits

Details Dual mode charge pump for automatic gain control circuits Dual mode charge pump for automatic gain control circuits

1994-09-26

1995-05-16

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327333, 327390, H03K 1716, G05F 110

Patent

active

054164370

ABSTRACT:
A dual mode charge pump for an AGC circuit is described. The charge pump of the present invention provides normal and accelerated rates of charge and discharge of a capacitor used to control the gain of an AGC amplifier. Current sources for providing accelerated charge and discharge rates are deselected when not needed. Since these current sources consume substantial amounts of power, deselecting them increases efficiency and reduces unnecessary power consumption. The current sources may be deselected internally or may be switched off by a switches in series with the current sources. The present invention also may be used to provide a self-timing function. The self-timing function allows the AGC to acquire the correct gain in an optimum time after initiation by an external control signal.

REFERENCES:
patent: 5202587 (1993-04-01), McLaury
patent: 5214316 (1993-05-01), Nagai

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