Amplifier circuit having a feedback circuit

Details Amplifier circuit having a feedback circuit Amplifier circuit having a feedback circuit

1990-11-13

1992-11-10

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, 330277, 330311, H03F 345

Patent

active

051627493

ABSTRACT:
An amplifier circuit is provided with first to third amplifying stages, a constant current source and a feedback circuit. The minimum value of current flowing through the output-stage transistor of the amplifier circuit is limited chiefly by the action of the feedback circuit. This prevents the output-stage transistor from becoming cut off, even when an excessive input signal is applied and high-speed circuit operation is realized. Also, a maximum value of current flowing through the output-stage transistor is limited so as to prevent an excessive output current. This will realize protection of the amplifier circuit against overcurrent.

REFERENCES:
patent: 3922614 (1975-11-01), van de Plassche
patent: 4912425 (1990-03-01), Kobayashi

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