Area and power efficient, high swing and monolitihic ground...

Details Area and power efficient, high swing and monolitihic ground... Area and power efficient, high swing and monolitihic ground...

2011-08-23

2011-08-23

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

C330S310000

Reexamination Certificate

active

08004366

ABSTRACT:
A minimal area, power efficient, high swing and monolithic ground centered headphone amplifier circuit operable on a low voltage. An input amplifier stage includes a first input terminal and a second input terminal and having a first gain. An output amplifier stage is coupled to an output of the input amplifier stage to provide an output signal and having a second gain. A feedback network coupled between the first input terminal and the output of the output amplifier stage. A level shifting unit coupled to the first input terminal and the feedback network. A charge pump coupled to the output amplifier stage to generate a negative supply voltage and to minimize a noise associated with the negative supply voltage using a loop gain of the amplifier, wherein the loop gain is a combination of the first gain, the second gain, and a gain of the feedback network.

REFERENCES:
patent: 7619479 (2009-11-01), Azuhata et al.
patent: 7808324 (2010-10-01), Woodford et al.

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