Stable bias current circuit for operational amplifier

Details Stable bias current circuit for operational amplifier Stable bias current circuit for operational amplifier

1996-09-18

1998-07-28

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330292, H03F 114

Patent

active

057867291

ABSTRACT:
A compensated bias current circuit for use in an operational amplifier including a differential input stage, a gain stage, and an output driver stage. The compensated bias current circuit includes a PNP current mirror control transistor having an emitter coupled to a first supply voltage conductor, a collector coupled by a first conductor to a first terminal of a current source circuit, and a base connected to a second conductor, with the second conductor connected to first and second PNP current mirror output transistors in the gain stage and a third PNP current mirror output transistor in the output driver stage. The compensated bias current circuit also includes an NPN current mirror control transistor having an emitter coupled to a second supply voltage conductor and a collector and base coupled by a third conductor to a second terminal of the current source circuit, a first NPN current mirror output transistor in the differential input stage, and a second NPN current mirror output transistor in the output driver stage. A single compensation capacitor is connected between the first conductor and the third conductor. The compensation circuit compensates instability in the PNP and NPN current mirrors and also provides balanced responses of the PNP and NPN current mirror to "glitches" in the power supply.

REFERENCES:
patent: 5418495 (1995-05-01), Harvey
patent: 5654671 (1997-08-01), Murray

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