Sense amplifier common mode dip filter circuit to avoid false mi

Details Sense amplifier common mode dip filter circuit to avoid false mi Sense amplifier common mode dip filter circuit to avoid false mi

1994-11-09

1995-10-17

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By pulse width or spacing

327205, 327551, H03K 508, H04B 110

Patent

active

054594162

ABSTRACT:
A high speed compare circuit includes a plurality of bit compare block circuits (0 through N) which are coupled in a wired OR configuration to a match line. Each bit compare block (0 through N) includes a compare circuit for receiving a bit and its complement from word A and a corresponding bit and its complement from word B. The compare circuit includes an output line which is normally maintained high to indicate that a match exists. The output line is coupled to a common mode dip filter which is comprised of N and P channel transistors. The output line of the compare circuit is coupled to the gates of a first and a second P channel transistor. The first P channel transistor is coupled to V.sub.cc, and the second P channel transistor is coupled in series to the first P channel transistor. The output line from the compare circuit is also coupled to the gate of an N channel transistor coupled in series with the first and second P channel transistors. The N channel transistor is also coupled to ground. A third P channel transistor is electrically coupled between the first and the second P channel transistors and to ground. A dip filter output line (referred to herein as "compare out") is coupled between the second P channel transistor and the N channel transistor, as well as to the gate of the third P channel transistor. In operation, the common mode dip filter of the present invention filters relatively short duration voltage dips from the output of the compare circuit. These transient voltage dips may be generated through the use of, for example, sense amplifiers to sense memory locations to retrieve words to be compared by the present invention.

REFERENCES:
patent: 4472820 (1984-09-01), Borras
patent: 4477919 (1984-10-01), Borras et al.
patent: 5177376 (1993-01-01), Wellnitz et al.

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