Pulse or digital communications – Repeaters – Testing
Patent
1990-03-09
1992-02-11
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
307265, 307602, 328 55, H04L 2520
Patent
active
050881060
ABSTRACT:
A phase shift circuit includes a first trailing-edge elongating circuit that elongates a trailing edge of each pulse of an input clock signal so as to fall gradually and outputs a first clock signal having a first elongated fall time. A signal inversion circuit inverts the first clock signal supplied from the first trailing-edge elongating circuit and outputs an inverted version of the first clock signal. A second trailing-edge elongating circuit elongates a trailing edge of each pulse of the inverted version of the first clock signal so as to fall gradually and outputs a second clock signal having a second elongated fall time. The second clock signal is an output signal of the phase shift circuit and lags behind the input clock signal by a predetermined time based on the first and second elongated fall times. The present invention further provides a repeater which uses the above-mentioned phase shift circuit.
REFERENCES:
patent: 3693101 (1972-09-01), Trimble
patent: 4370569 (1983-01-01), Hunsinger
patent: 4801827 (1989-01-01), Metz
patent: 4935701 (1990-06-01), Kawai et al.
Hayami Kazunori
Kitamura Mitsuo
Fujitsu Limited
Safourek Benedict V.
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