A bias circuit selects the second external input voltage or voltage obtained by adding bias voltage to the second external input voltage, according to the output voltage of the amplifying circuit, and outputs it as {HEAD ~ the voltage} corresponding to {TAIL ~ second external input voltage} 
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A bias circuit selects the second external input voltage or voltage obtained by adding bias voltage to the second external input voltage , according to the output voltage of the amplifying circuit , and outputs it as { HEAD ~ the voltage } corresponding to { TAIL ~ second external input voltage }
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