Low distortion differential amplifier circuit

Details Low distortion differential amplifier circuit Low distortion differential amplifier circuit

1996-04-23

1998-06-30

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330259, H03F 345

Patent

active

057740194

ABSTRACT:
The invention is a low distortion differential amplifier circuit with the following characteristics: there are outputs OUT1, OUT2, inputs IN1, IN2; a ground GND that is connected to each of the current sources 14, 16; each transistor 10, 12 is connected in series to each of the above outputs OUT1, OUT2 and to each of the current sources 14, 16; each of the above transistors' 10, 12 base (or gate) is connected to the output of an operational amplifier 18, 20; each of the above transistors' 10, 12 emitter (or source) is connected by the resistor 22; the positive input of each of the above operational amplifiers 18, 20 is connected to one of the above inputs IN1, IN2; the terminal of each of the above transistors 10, 12 that is connected to the resistor is also connected to a voltage source 30, 32 which is then connected to the negative input of the above operational amplifier 18, 20. Transistors with special bases (or gates) are used in the input stage of the operational amplifiers mentioned above.

REFERENCES:
patent: 4163950 (1979-08-01), Dann et al.
patent: 4667166 (1987-05-01), Itoh
patent: 5218318 (1993-06-01), Ikuzawa

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