Automatic bias operational amplifying circuit and system
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United States of America Patent
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Issued Date -
Mar 21, 2013
app pub date -
May 17, 2012
filing date -
Sep 21, 2011
priority date (Note) -
Abandoned
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Abstract
An automatic bias operational amplifying circuit, includes a control sub-circuit and an offset sub-circuit connected to the control sub-circuit. The control sub-circuit includes a first input terminal, a second input terminal, a first field-effect transistor connected to the offset sub-circuit, a second field-effect transistor connected to the first input terminal, a third field-effect transistor connected to the second input terminal, a first output terminal connected to the second field-effect transistor, a second output terminal connected to the third field-effect transistor, a first resistor connected to the first output terminal, and a second resistor connected to the second output terminal. The offset sub-circuit includes a reference voltage terminal, a comparator connected between the reference voltage terminal and the control sub-circuit, a third resistor connected between the comparator and the second output terminal, and a fourth resistor connected between the comparator and the first output terminal Its system is further provided.
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