Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-12-01
1991-09-03
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
328155, H03D 0324
Patent
active
050460757
ABSTRACT:
A method and an apparatus for adapting a locally-generated clock having an arbitrary phase relation to a plesiochronous data signal in which further clocks are derived from the clock via a delay line chain in such a fashion that a clock sequence having identical phase spacings is produced. These clocks are clocked by the data signal in edge-triggered D-flip-flops. The difference between the logical states of the Q outputs of two neighboring D-flip-flops provides a preselection of the best-adapted clock. Proceeding from the Q outputs and Q outputs of the D-flip-flops and the non-inverting and inverting outputs of a plurality of amplifiers, a gate arrangement connects an optimally-adapted clock to a clock output. A data signal is delayed in a delay unit by the time that the selection of the optimally-adapted clock requires. This then clocks the delayed data signal in an edge-triggered D-flip-flop.
REFERENCES:
patent: 4780889 (1988-10-01), Ley et al.
patent: 4955040 (1990-09-01), Sarkoezi
patent: 4959846 (1990-09-01), Apple et al.
Klinger Karlheinz
Kraemer Horst
Bocure Tesfaldet
Safourek Benedict V.
Siemens Aktiengesellschaft
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