Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1996-05-22
1997-12-30
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 69, 327 71, G01R 1900, H03K 522
Patent
active
057035032
ABSTRACT:
A winner-take-all circuit for judging a channel receiving an analog signal having the largest or smallest value among multiple channels upon input of analog signals. Each basic circuit includes a detecting unit for comparing an input voltage with a reference voltage, and a feedback current generating unit for outputting a feedback current that determines a judging range in response to an output voltage from the detecting unit. The winner-take-all circuit also includes a tenth transistor serving as a common transistor to all the basic circuits. The tenth transistor secures, even when an input voltage is small, a current that should flow through a sixth transistor serially connected to the seventh transistor that determines an amount of a feedback current from the feedback current generating circuit. As a result, even when there are fewer k channels receiving input voltages having the highest level and slightly lower ones compared with all the n channels, a feedback current is secured in a sufficient amount to vary the reference voltage. In addition, the winner-take-all circuit of the present invention comprises analog circuits, thereby making the structure simpler compared with a counterpart that processes digital signals.
REFERENCES:
patent: 5049758 (1991-09-01), Mead et al.
patent: 5059814 (1991-10-01), Mead et al.
patent: 5408194 (1995-04-01), Steinbach et al.
patent: 5606271 (1997-02-01), Van Lammeren et al.
Choi J. "A High-Precision VLSI Winner-Take-All Circuit for Self-Organizing Neural Network", IEEE. Journal of Solid-State Circuits, vol. 28, No. 5, pp. 576-584, 1993.
M. Ismail et al. "Analog VLSI: Signal and Information Processing", McGraw-Hill, Inc., p. 100, FIG. 3.31, 1994.
Fujio Mitsuhiko
Iizuka Kunihiko
Matsui Hirofumi
Miyamoto Masayuki
Conlin David G.
Daley, Jr. William J.
Sharp Kabushiki Kaisha
Tran Toan
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