Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1990-04-05
1992-06-30
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
3701055, H04L 700
Patent
active
051270269
ABSTRACT:
In accordance with the invention, a circuit and a method for extracting a clock signal from a serial data stream are provided. A window pulse is generated such that transitions of a delayed version of the serial data stream occur near the center of the window pulse. A PUP signal and a PDN signal are generated having pulse widths indicative of the time at which transitions of the clock signal occur with respect to the window pulse. The PUP and PDN signals are used to generate a reference voltage to control the clock frequency. Window pulses may be generated in response to only positive transitions or to only negative transitions of the delayed serial data stream, or alternatively may be generated in response to both negative and positive transistions. The amount of delay introduced to the serial data stream may be selectively adjusted for different bit rates.
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patent: 3825844 (1974-07-01), Peterman et al.
patent: 3961138 (1976-06-01), Fellinger
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patent: 4606050 (1986-08-01), Sekigawa et al.
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Graham Andrew C.
Kelly Richard J.
Tran Dung Q.
Chin Stephen
Gazelle Microcircuits, Inc.
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