Pulse or digital communications – Transceivers – Modems
Patent
1996-05-22
1998-03-10
Tse, Young T.
Pulse or digital communications
Transceivers
Modems
455 76, 455 86, 375376, H04L 700
Patent
active
057270198
ABSTRACT:
A modem LSI includes a combination of a first frequency divider, a first PLL circuit composed of a phase comparator, an LPF and a VCO, and a first select switch for selecting one of the first frequency divider and the first PLL circuit to provide a detection clock for a detector and a combination of a second frequency divider, a second PLL circuit composed of a phase comparator, an LPF and a VCO, and a second select switch for selecting one of the second frequency divider and the second PLL circuit to provide an operation clock for a roll-off wave generator and a clock regenerator, the first and second frequency dividers and the first and second PLL circuits each receiving a reference clock from a common oscillator installed outside the LSI.
REFERENCES:
patent: 5230088 (1993-07-01), Kramer, Jr. et al.
patent: 5471652 (1995-11-01), Hulkko
patent: 5497126 (1996-03-01), Kosiec et al.
patent: 5511236 (1996-04-01), Umstattd et al.
patent: 5519885 (1996-05-01), Vaisanen
patent: 5535432 (1996-07-01), Dent
patent: 5574985 (1996-11-01), Ylikotila
patent: 5603099 (1997-02-01), Watanabe
patent: 5640688 (1997-06-01), Ruitenburg
NEC Corporation
Tse Young T.
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