Digitally programmable linear phase filter having phase equaliza

Details Digitally programmable linear phase filter having phase equaliza Digitally programmable linear phase filter having phase equaliza

1991-07-31

1993-09-14

Mai, Tan V.

Boots, shoes, and leggings

36472401, G06G 702, G06F 1531

Patent

active

052455653

ABSTRACT:
A digitally programmable Bessel filter includes a plurality of serially connected stages or biquads with each biquad including a plurality of programmable operational transconductance amplifiers. The first stage of the filter provides an all pass equal amplitude response. Two stages provide pulse slimming (first and second derivatives of an input pulse), and three stages provides a sixth order Bessel low pass function. The operational transconductance amplifiers are controlled by a fine tuning control signal, and an array of integrating capacitors are selectively controlled by a coarse tuning signal. The fine tuning and coarse tuning signals are generated in a phase locked loop from a reference clock and a reference biquad which receives the reference clock.

REFERENCES:
patent: 4354248 (1982-10-01), Conger et al.
patent: 4799112 (1989-01-01), Bremmer et al.
patent: 4945311 (1990-07-01), Smith
patent: 5122718 (1992-06-01), Sawata
Advance Information on SSI 32 F8010 Programmable Electronic Filter, Silicon Systems, Feb. 1990.
Tsutomu Wakimoto, et al. "A Low-Power Wide-Band Amplifier Using a New Parasitic Capacitance Compensation Technique," IEEE Journal of Solid-State Circuits, vol. 25, No. 1, Feb. 1990.
Howard C. Yang, et al. "An Active-Feedback Cascode Current Source," IEEE Transactions on Circuits and Systems, vol. 37, No. 5, May 1990.

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