Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Patent
1995-06-07
1998-03-03
Chin, Stephen
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
H04L 700
Patent
active
057243964
ABSTRACT:
A CMOS integrated signal processing system for a sampling receiver includes a timing recovery circuit, wherein an on-chip numerically controlled oscillator is operative at periods T that are initially equal to the nominal baud rate of the signals controls a sinc interpolator receiving samples at the sampling rate. A loop filter is coupled to the sinc interpolator and to the numerically controlled oscillator. The arrangement is capable of handling various symbol rates. The system includes a circuit for carrier recovery having a second on-chip numerically controlled oscillator, a digital derotation circuit responsive to the second numerically controlled oscillator, accepting an in phase component and a quadrature component of the sampled signals. An adaptive phase error estimation circuit is coupled in a feedback loop.
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Claydon Anthony Peter J.
Gammack Richard J.
Bickel Arthur S.
Braun Robert T.
Chin Stephen
Clark Ronald J.
Discovision Associates
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