Pulse or digital communications – Repeaters – Testing
Patent
1991-07-26
1994-06-21
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 36, 333 33, 307354, 307363, 345 1, H03K 5153
Patent
active
053234200
ABSTRACT:
A regeneration circuit (16) is disclosed for regenerating noisy, received digital signals in a high impedance signal line (22). A buffer amplifier (30) is provided with a feedback resistor (36), with the feedback resistor and input to the buffer amplifier coupled to line (22) and to a pull-up resistor (34). The values of resistors (34 and 36) are selected such that when a normally "high" logic potential on line (22) is pulled "low" and then released, the buffer amplifier functions to source current to line (22) during the falling transition; and after the amplifier transitions "low," it sinks current from line (22). Thus, buffer amplifier (30) acts first as a pull-up device during the falling transition and then as a pull-down device during the rising transition. This restores the received logic signals to digital levels and reduces noise about the switching points in the rising and falling transitions.
REFERENCES:
patent: 4068138 (1978-01-01), Miyakawa et al.
patent: 4169232 (1979-09-01), Henrich
patent: 4644293 (1987-02-01), Kenneth
patent: 4885718 (1989-12-01), Asprey et al.
patent: 4890065 (1989-12-01), Laletin
patent: 5019722 (1991-05-01), Hess et al.
Chin Stephen
Cybex Corporation
Tse Young
LandOfFree
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