Current mode biquadratic active filter

Details Current mode biquadratic active filter Current mode biquadratic active filter

H - Electricity

03

H

333/51

H03H 11/12 (2006.01)

Patent

CA 1152167

Abstract A configuration of two transistors and two capaci- tors provides a current mode second-order active filter for IC implementation with low-pass, bandpass and high- pass capabilities. The filter frequency is tunable over a wide range, independently of filter Q and gain, by varying a DC bias current. The filter can provide one-port impedance functions, and two-port voltage, cur- rent and impedance transfer functions. With the addition of a second biasing current source, the filter Q can be controlled by adjusting the ratio of the two biasing current sources. Enhanced dynamic range and large-signal performance can be achieved by the addition of linear resistors, with trade-offs in tunable frequency range and frequency linearity.

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