Finite impulse response filter

Details Finite impulse response filter Finite impulse response filter

1997-02-25

1999-08-03

Mai, Tan V.

Electrical computers: arithmetic processing and calculating

Electrical analog calculating computer

Particular function performed

708 3, G06G 702, G06J 100

Patent

active

059318988

ABSTRACT:
A finite impulse response filter uses rotating tap weights that are connected in turn to a succession of sample/hold (S/H) cells in each of which is held a separate successive sample of an analog balanced signal being filtered for an interval long enough to tap to each tap weight in one rotation. Each of the S/H cells is a switched-current memory cell and includes a primary negative feedback transconductance differential amplifier and a primary pair of storage capacitors and a secondary positive feedback transconductance differential amplifier and a secondary pair of storage capacitors. Charge injection errors created in each primary amplifier are replicated in an associated secondary amplifier and used to cancel these errors to provide higher fidelity samples for summing for forming the output of the filter.
The tap weights are provided by binary-ratioed resistors provided by transistors of binary-ratioed transconductances.

REFERENCES:
patent: 5563819 (1996-10-01), Nelson
Y. Haque and M. Copeland "Distortion in Rotating Tap Weight Transversal Filters" Jun. 1979 IEEE Journal of Solidstate Circuits vol. SC-14 #3 pp. 627-633.
J.B. Hughes N.C. Bird I.C. Mac Beth "Switched Currents--A New Technique for Analog Sampled-Data Signal Processing" ISCAS '89 pp. 1584-1587.

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