Filter circuit

Details Filter circuit Filter circuit

1979-09-24

1981-09-08

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330294, 330305, 330306, H03F 345

Patent

active

042887542

ABSTRACT:
A filter circuit, preferably a low-pass filter, whose cut-off frequency is easily controlled and which can be manufactured as an integrated circuit. First and second transistors are connected in differential amplifier configuration, and a current source is connected to the common connection of the emitter electrodes thereof. The base electrode of the first transistor is connected to an input terminal. A reactance element is connected between the collector electrode of the second transistor and a source of reference potential, such as ground. A third transistor has its emitter electrode connected to the base electrode of the second transistor and its base electrode connected to the collector electrode of the second transistor. An output terminal is connected to the emitter electrode of the third transistor.

REFERENCES:
patent: 3614478 (1971-10-01), Schiff
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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