Filter circuit

Details Filter circuit Filter circuit

1979-09-26

1981-12-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330294, 330305, 330306, 331116R, 358 28, H03F 345

Patent

active

043061982

ABSTRACT:
A filter circuit whose cut-off frequency is easily controlled and which can be manufactured as an integrated circuit. The base electrode of a first transistor is connected to an input terminal by a reactance element, such as a capacitor. Second and third transistors are connected in differential amplifier configuration, and a current source is connected to the common connection of the emitter electrodes thereof. The emitter electrode of the first transistor is connected to the base electrode of the second transistor and the base electrode of the first transistor is connected to the collector electrode of the second transistor. An output terminal is connected to at least one of the collector and emitter electrodes of the first transistor.

REFERENCES:
patent: 3743764 (1973-07-01), Wittmann
patent: 3969682 (1976-07-01), Rossum
Franco, "Use Transconductance Amplifiers to Make Programmable Active Filters", Electronic Design, vol. 24, No. 19, pp. 98-101, Sep. 13, 1976.

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