Amplifier circuits for driving large capacitive loads

Details Amplifier circuits for driving large capacitive loads Amplifier circuits for driving large capacitive loads

1996-09-05

1998-04-28

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

310316, 310317, 318116, 327436, H03K 100

Patent

active

057449880

ABSTRACT:
In an amplifier for driving a large capacitive load, a boost circuit is included to improve the efficiency of the amplifier where an input to the amplifier has a small signal swing. The amplifier comprises a stack of series-connected charge-storage capacitors serving as secondary power sources. During a charging of the capacitive load, charge is obtained from voltage nodes between the stack capacitors. One or more low-voltage power supplies are connected to the capacitive load in the boost circuit. With these power supplies, during a discharge of the capacitive load, the latter appears to be charged to a higher voltage than it actually is so as to return some charge to the highest voltage node from where a portion of its charge was obtained. As a result, the power consumption in the amplifier is substantially reduced.

REFERENCES:
patent: 4404502 (1983-09-01), Magori et al.
patent: 4767959 (1988-08-01), Sakakibara et al.
patent: 4947074 (1990-08-01), Suzuki
patent: 5264752 (1993-11-01), Savicki

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