Vector absolute--value calculation circuit

Details Vector absolute--value calculation circuit Vector absolute--value calculation circuit

1997-08-12

1999-09-28

Mai, Tan V.

Electrical computers: arithmetic processing and calculating

Electrical analog calculating computer

Particular function performed

708835, G06G 700, G06G 716

Patent

active

059580020

ABSTRACT:
A highly accurate vector absolute-value calculation circuit uses analog processing and minimal hardware. Signal voltages corresponding to an I component (real number part) and a Q component (imaginary number part) are input to a first absolute-value calculation circuit 13 and a second absolute-value calculation circuit 14 through terminals 11 and 12, respectively, and they are each converted into absolute-value signals. The component I absolute-value and component Q absolute-value are compared in a comparison circuit 20. According to the result, the larger absolute-value signals are output to an input capacitor 23 of a neural computation circuit, and the smaller absolute-value signals are output to an input capacitor 24 by controlling multiplexers 21 and 22. The capacity ratio of a feedback capacitor 26 of a neural computation circuit and input capacitors 23 and 24 is 11:10:5. The complex number absolute-value calculated by the following formula is output from an output terminal 27. ##EQU1##

REFERENCES:
patent: 4032768 (1977-06-01), Rieger
patent: 5751624 (1998-05-01), Zhou et al.
Sanchez-Sinencio et al, "Switched Capacitor Filters" The Circuits and Filters Handbook, CRC Press, Inc., 1995, pp. 2491-2520.
Allen et al, "CMOS Analog Circuit Design", Holberg, Harcourt Brace Jovanovich College Publishers, 1987, p. 558.

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