Pulse or digital communications – Repeaters – Testing
Patent
1989-07-11
1991-09-24
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
331 17, 375120, H04L 2552
Patent
active
050520229
ABSTRACT:
A PLL circuit for generating an AC output signal synchronized with an AC input signal applied thereto with a phase offset with respect to the input signal includes, in one embodiment, a charge pump circuit capable of varying the phase offset depending on the frequency of the AC input signal. In a signal transmission network system including a plurality of nodes coupled to a signal transmission line and distanced from one another by various repeat lengths of transmission path, each node has a repeater including such PLL circuit to suppress jitter caused by individual repeat length of transmission over the transmission line and still remaining in an equalized AC signal in each node.
REFERENCES:
patent: 4078157 (1978-03-01), Lender et al.
patent: 4215251 (1980-07-01), Fukuda et al.
patent: 4523157 (1985-06-01), Sato
patent: 4667170 (1987-05-01), Lofgren et al.
patent: 4733404 (1988-03-01), Ostoich
patent: 4749961 (1988-06-01), Kato et al.
patent: 4818950 (1989-04-01), Ranger
IBM Journal of Research Development, vol. 29, No. 6, Nov. 1985, pp. 580-587.
Hirai Masato
Nishita Shigeo
Yoshino Ryozo
Hitachi , Ltd.
Safourek Benedict V.
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