Multiple input comparator circuit for a switched resistive netwo

Details Multiple input comparator circuit for a switched resistive netwo Multiple input comparator circuit for a switched resistive netwo

1993-12-07

1995-01-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

323281, 327 63, 327 65, H03K 524

Patent

active

053810546

ABSTRACT:
A comparator circuit, for a switched resistive network which may be combined with a transconductance amplifier, simultaneously and independently compares a plurality of input voltages to a reference voltage. The circuit comprises a current splitter having a current input, a plurality of comparator outputs, and a corresponding plurality of voltage inputs that control the fraction of the input current available at each comparator output. A reference output of the current splitter is provided as an input to a current mirror, and each of the comparator outputs of the current splitter is connected to a corresponding output of the current mirror. The current available at each of the current mirror outputs is a function of the reference input provided from the current splitter. The comparator circuit needs only one bias input and one reference input. The inclusion of a second biasing device with an associated mirror device produces a transconductance amplifier combined with the comparator circuit. This combination minimizes the integrated circuit area required for transconductors and comparators on image processing chips.

REFERENCES:
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patent: 4849661 (1989-07-01), Bazes
patent: 5218440 (1993-06-01), Mathur
T. Delbruck, "`Bump` Circuits for Computing Similarity and Dissimilarity of Analog Voltages," IEEE International Joint Conference on Neural Networks, Seattle, Wash., vol. 1, pp. I-475-479 (Jul. 8-12, 1991).
P. C. Yu et al., "CMOS resistive Fuses for Image Smoothing and Segmentation," IEEE Journal of Solid-State Circuits, vol. 27, No. 4, pp. 545-553 (Apr. 1992).
J. G. Harris, "Analog Models for Early Vision," Ph.D. Thesis, California Institute of Technology, pp. 41-49 and 61-64 (May 1991).

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