Active filter circuit

Details Active filter circuit Active filter circuit

H - Electricity

03

H

333/53

H03H 11/06 (2006.01) H03H 11/12 (2006.01)

Patent

CA 2014968

An active filter circuit includes a first and second differential pairs each having a pair of transistors. A capacitor is connected to a collector of each on transistor of the first and second differential pairs. A first and second negative feed-back paths are connected, respectively, between the collector and a base of one transistor of the first differential pair and between the collector of one transistor of the second differential pair and a base of the other transistor of the first differential pair. By applying suitable voltages to respective inputs of the differential pairs, the active filter circuit functions as a band-pass filter, lowpass filter, high-pass filter, band elimination filter or phase-shifting filter with the same circuit configuration. A current mirror circuit correlatively changes current amounts of the first and second differential pairs in response to a control voltage, whereby a filter characteristic can be changed.

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