Universal active filter

Details Universal active filter Universal active filter

1993-05-27

1994-05-31

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, H03B 100, H03K 500

Patent

active

053172175

ABSTRACT:
A universal filter is provided with three inputs Vh, Vb and V1, with one output Vout, with two transconductance amplifiers Gm1, Gm2, with four capacitors mCO, (1-m)CO, CO and LCO and an amplifier K as well as a voltage follower VF. Depending on the connections of the three inputs, the universal filter takes the form of a high-pass or low-pass or band-pass filter or a trap filter or an all-pass or an otherwise active filter. Advantageously, by selection of parameters (e.g., trans-conductance, gain, scaling), the various filter characteristics like quality (Q), slope, median frequency, amplification, etc., may be adjusted. A further advantage is that the low component count of the filter provides improved reliability, reduced cost and facilitates efficient and economic fabrication in discrete or integrated circuit form.

REFERENCES:
patent: 4851718 (1989-07-01), Hagino et al.
patent: 4857778 (1989-08-01), Hague
patent: 5182478 (1993-01-01), Nomura
patent: 5192884 (1993-03-01), Kusano
IEEE Transactions on Circuits and Systems, vol. 35, No. 8, Aug. 1988, New York, pp. 936-945, Sanchez-Sinencio et al., "Generation of Continuous-Time Two Integrator Loop OTA Filter Structures".

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