High-pass filter structure with programmable zeros

Details High-pass filter structure with programmable zeros High-pass filter structure with programmable zeros

1995-05-31

1997-07-01

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 327103, 330305, H03F 368

Patent

active

056442670

ABSTRACT:
A high-pass filter in particular for high-frequency applications and of the type comprising at least one input terminal (IN) and at least one output terminal (OUT) between which is defined a transfer function (FdT) and is inserted a biquadratic cell (18) incorporating a series of transconductance stages (2, 3, 4, 5) comprises a generator circuit (29) of variable currents (i.sub.K1, i.sub.K2) connected between a pair of stages (2, 3) of the biquadratic cell (18) and a voltage reference (GND). Said generator allows introduction of programmable zeroes in the transfer function (FdT) of the filter (20).

REFERENCES:
patent: 5357208 (1994-10-01), Nelson
R. L. Geiger et al., "Active Filter Design Using Operational Transconductance Amplifiers: A Tutorial," IEEE Circuits and Devices Magazine, vol. 1, No. 2, p. 20 (1985).
A. P. Nedungadi et al., "High-Frequency Voltage Controlled Continuous-Time Lowpass Filter Using Linearized CMOS Integrators," Electronics Letters, vol. 22, No. 14, p. 729 (1986).

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