Filter circuit

Details Filter circuit Filter circuit

H - Electricity

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H03H 9/46 (2006.01) H03B 5/36 (2006.01) H03G 5/00 (2006.01) H03H 11/04 (2006.01) H03H 11/12 (2006.01) H03H 11/20 (2006.01) H03H 11/54 (2006.01)

Patent

CA 1128616

? S79P123 FILTER CIRCUIT ABSTRACT OF THE DISCLOSURE 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 configura- tion, and a current source is connected to the common connec- tion 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. -i-

336258

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