发明名称 |
Wide bandwidth, current sharing, Mosfet audio power amplifier with multiple feedback loops |
摘要 |
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.
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申请公布号 |
US6144256(A) |
申请公布日期 |
2000.11.07 |
申请号 |
US19980118195 |
申请日期 |
1998.07.17 |
申请人 |
BARBETTA, ANTHONY T. |
发明人 |
BARBETTA, ANTHONY T. |
分类号 |
H03F1/08;H03F1/34;H03F3/26;H03F3/30;(IPC1-7):H03F3/26 |
主分类号 |
H03F1/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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