Low voltage class AB amplifier with gain boosting

Details Low voltage class AB amplifier with gain boosting Low voltage class AB amplifier with gain boosting

1999-04-05

2000-10-03

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

061278912

ABSTRACT:
A low voltage amplifier with gain boosting and a reduced power supply voltage requirement. A cascode amplifier circuit, biased with the power supply voltage, amplifies a pair of related, differential input signals based upon a pair of gain boost control signals and in accordance therewith provides a pair of gain boosted signals which correspond to the input signals. A gain boost control circuit, also biased with the power supply voltage, uses the differential input signals to generate the gain boost control signals. A class AB amplifier circuit, also biased with the power supply voltage, amplifies the gain boosted signals and in accordance therewith provides a class AB output signal which corresponds to the original input signals. The cascode amplifier circuit, gain boost control circuit and class AB amplifier circuit together operate with a minimum power supply voltage which equals a sum of one active transistor input bias potential and two active transistor output bias potentials

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R Hogervorst et al., "A Programmable 3-V CMOS Rail-to-Rail Opamp with Gain Boosting for Driving Heavy Resistive Loads", IEEE International Symposium on Circuits and Systems Proceedings of the 1995 IEEE International Symposium on Circuits and Systems--ISCAS 95. Part 2 (of 3) Apr. 30-May 3, 1995 v2 1995, Seattle, WA, USA, pp. 1544-1547.
K. de Langen et al., "Compact 1.8V Low-Power CMOS Operational Amplifier Cells for VLSI", ISSCC Digest of Technical Papers, 1997 IEEE International Solid-State Circuits Conference, Feb. 1997, pp. 346-348.

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