Class AB output stage with programmable bias point control

Details Class AB output stage with programmable bias point control Class AB output stage with programmable bias point control

2011-03-15

2011-03-15

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

Reexamination Certificate

active

07907013

ABSTRACT:
A class AB output stage includes a driver to generate a first drive signal and a second drive signal, and two bias voltage sources to provide two bias voltages to level shift the first and second drive signals, in order to drive a pair of high side and low side transistors, respectively. A control circuit provides a control signal to adjust the first and second bias voltages, so as to shift the bias point of the class AB output stage. The control signal is determined according to the currents in the high side and low side transistors and a programmable parameter. By adjusting the parameter, the bias point deviation can be removed to obtain both low quiescent current and best THD performance.

REFERENCES:
patent: 6005440 (1999-12-01), Okamoto
patent: 7145393 (2006-12-01), Lubbers

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