Bias current compensated operational amplifier circuit

Details Bias current compensated operational amplifier circuit Bias current compensated operational amplifier circuit

H - Electricity

03

F

330/106

H03F 3/45 (2006.01) H03F 1/30 (2006.01)

Patent

CA 1102419

Abstract of the Disclosure Operational amplifier circuitry is provided which comprises an operational amplifier having a first input port and a second input port, and a compensating circuit for making a voltage difference between the first and the second input ports of the operational amplifier substantially equal to the offset voltage of the ampli- fier, compensating the bias currents of the operational amplifier. The compensating circuit may include a series of a first resistor and a second resistor con- nected between the first and the second input ports of the amplifier. The node connecting the first and the second resistors is coupled to a predetermined voltage, the resistances of the first and the second resistors being selected so that a voltage difference between the first and the second input ports of the amplifier is substantially equal to the offset voltage of the operational amplifier. A resistor may be connected between the first and the second input ports of the amplifier instead of the series of the first and the second resistors. - I -

268713

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