Methods and apparatus to reduce idle current in power...

Details Methods and apparatus to reduce idle current in power... Methods and apparatus to reduce idle current in power...

2008-12-01

2010-11-30

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

Reexamination Certificate

active

07843265

ABSTRACT:
Power amplifiers with reduced idle currents are described. In some examples, a power amplifier includes a driver configured to generate a control signal based on an input signal. The power amplifier also includes a first output transistor configured to selectively provide an output signal via an output channel that has a resistance based on the control signal, and a channel adjuster configured to generate several digital signals based on the control signal. A composite switch, which includes several segment transistors, is included to selectively increase or decrease the output channel resistance based on the digital signals.

REFERENCES:
patent: 6788147 (2004-09-01), Lubbers

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