Amplifier having an output stage with bias current cancellation

Details Amplifier having an output stage with bias current cancellation Amplifier having an output stage with bias current cancellation

1994-12-05

1995-11-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330286, 330296, H03F 345

Patent

active

054711746

ABSTRACT:
An amplifier circuit (10) receives a differential input signal and provides an amplified differential signal. A converter circuit (14) is responsive to the amplified differential signal and provides a single-ended signal. An output stage (16) is responsive to the single-ended signal for providing an output signal of the amplifier circuit. The output stage provides bias cancellation for the single-ended signal by injecting a current equal to the bias requirement of the input transistors (20, 38). The bias cancellation maintains a high input impedance and high gain and output drive for the output stage.

REFERENCES:
patent: 5406222 (1995-04-01), Brokaw

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