DC-offset canceler circuit and differential amplifier circuit eq

Details DC-offset canceler circuit and differential amplifier circuit eq DC-offset canceler circuit and differential amplifier circuit eq

1997-11-20

1999-02-02

Nguyen, Matthew V.

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

330124D, H03F 368

Patent

active

058670629

ABSTRACT:
A dc-offset canceler circuit is provided, which cancels a dc offset more effectively. This circuit includes a first differential pair of emitter-coupled first and second bipolar transistors driven by a first constant current source/sink, and a second differential pair of emitter-coupled third and fourth bipolar transistors driven by a second constant current source/sink. The first and second differential pairs are coupled by a coupling capacitor. An emitter of a fifth bipolar transistor is connected to the emitters of the first and second transistors. An emitter of a sixth bipolar transistor is connected to the emitters of the third and fourth transistors. Bases of the first and fifth transistors are connected to a first input terminal. A base of the second transistor is connected to the first input terminal through a first resistor. Bases of the fourth and sixth transistors are connected to a second input terminal. A base of the third transistor is connected to the second input terminal through a second resistor. Collectors of the first, third, and sixth transistors are connected to a first output terminal, and those of the second, fourth, and fifth transistors are connected to a second output terminal.

REFERENCES:
patent: 4933642 (1990-06-01), Lee
patent: 5506537 (1996-04-01), Kimura
patent: 5557239 (1996-09-01), Masao

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