Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Input noise margin enhancement
Patent
1995-12-19
1997-03-18
Hudspeth, David R.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Input noise margin enhancement
326 31, 327 68, H03K 1713
Patent
active
056126301
ABSTRACT:
An asynchronous self-adjusting circuit includes an input circuit receiving an input signal and providing an output signal. The input circuit starts to switch the output signal to a first logic level based on the level of the input signal reaching a falling edge adjustable trip point, and starts to switch the output signal to a second logic level based on the level of the input signal reaching a rising edge adjustable trip point. A control circuit dynamically and asynchronously adjusts the falling and rising edge adjustable trip points as a function of a previous value of the input signal to permit the asynchronous self-adjusting circuit to respond quickly to changes in the input signal without causing oscillation of the output signal by asynchronously controlling when the output signal is permitted to again switch logic states once the output signal switches logic states.
REFERENCES:
patent: 4958088 (1990-09-01), Farah-bakhsh et al.
patent: 5034623 (1991-07-01), McAdams
patent: 5278460 (1994-01-01), Casper
patent: 5341033 (1994-08-01), Koker
patent: 5347177 (1994-09-01), Lipp
patent: 5361002 (1994-11-01), Casper
patent: 5539779 (1996-07-01), Nagahori
Cloud Eugene H.
Wright Jeffrey P.
Hudspeth David R.
Micro)n Technology, Inc.
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