Data transmission system receiver having phase-independent bandw

Details Data transmission system receiver having phase-independent bandw Data transmission system receiver having phase-independent bandw

1991-01-31

1993-01-26

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375 81, H03D 324

Patent

active

051827611

ABSTRACT:
A data transmission system receiver is disclosed which receives a formatted data stream (302) and operates in one of at least a first bandwidth mode and a second bandwidth mode. The formatted data stream (302) comprises a plurality of data edges (108, 110) and is sampled by a first clock signal (320). A plurality of clock edges (102, 104) defining transitions from one logic state to another is used to define "early" and "late" data edge occurrences. These occurrences are accumulated in accumulators (310, 312) and used as inputs to a clock counter (318) which produces a phase-adjusted clock signal (320). Additionally, the data transmission receiver comprises a detector (330) for detecting when a limited data stream (306) is synchronized with the phase-adjusted clock signal (320) and, in accordance with a predetermined algorithm, is able to switch the phase-lock circuit from the first bandwidth mode to the second bandwidth mode.

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