Wide bandwidth, current sharing, MOSFET audio power amplifier wi

Details Wide bandwidth, current sharing, MOSFET audio power amplifier wi Wide bandwidth, current sharing, MOSFET audio power amplifier wi

1996-12-30

1998-09-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330100, 330102, 330105, 330255, 330265, 381121, H03F 330

Patent

active

058150404

ABSTRACT:
A wide bandwidth, multi-FET current sharing output stage, MOS audio power amplifier employs multiple feedback loops. An audio input is supplied to a voltage feedback amplifier stage driving a push-pull voltage gain/phase splitter stage. A bias adjustment stage driven from the push-pull voltage gain/phase splitter stage drives a current drive stage. The current drive stage drives an output stage comprising a plurality of paralleled current shared individual MOS output transistors driving an output node connected to a load. Up to three feedback loops are employed. A first voltage feedback loop comprises a voltage feedback stage having an input connected to a voltage divider driven from the first terminal of the load and an output connected to a feedback input node in the voltage feedback amplifier stage. A second voltage feedback loop comprises a voltage feedback stage having an input connected to the first terminal of the load and an output connected to a feedback input node in the push-pull voltage gain/phase splitter stage. A third feedback loop comprises a current feedback stage having an input in series between the output node and the load and an output connected to a feedback input node in the voltage feedback amplifier stage. The current feedback connection works in conjunction with input stage to lower distortion and provide a relatively flat frequency response.

REFERENCES:
patent: 4464634 (1984-08-01), Velazquez

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