Current mode biquadratic active filter

Details Current mode biquadratic active filter Current mode biquadratic active filter

1980-05-12

1982-07-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330109, 330303, H03F 134

Patent

active

043408680

ABSTRACT:
A configuration of two transistors and two capacitors 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, current 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.

REFERENCES:
patent: 3792367 (1974-02-01), Fleischer et al.

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