Comparator using XNOR and XOR gates

Details Comparator using XNOR and XOR gates Comparator using XNOR and XOR gates

1993-11-24

1995-02-21

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

36518907, 327 63, 326 52, 326 54, H03K 522, H03K 1921

Patent

active

053919386

ABSTRACT:
A comparator for comparing the voltages of an address pair signals in complement with the voltages of bit pair signals in complement includes a pair of transistors for receiving the bit pair signals and a pair of MOSFETs for receiving the address pair signals. One transistor and one MOSFET are connected in series to define a first current path and other transistor and other MOSFET are connected in series to define a second current path. When the address signal and the bit signal are the same, both the first and second current paths close, but when they are different, either the first or the second current path opens to permit a current to pass therethrough. By detecting the current in the path, the coincidence and non-coincidence between the address pair signals and bit pair signals are detected.

REFERENCES:
patent: 4575648 (1986-03-01), Lee
patent: 4710650 (1987-12-01), Shoji
patent: 5117133 (1992-05-01), Luebs
Hideo Maejima et al., "Circuit Technologies for BiCMOS VLSI's as Computer Elements", Proceedings, 1989 IEEE International Conference on Computer Design: VLSI in Computers & Processors, Oct. 2-4, 1989, pp. 318-321.

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