Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1984-06-20
1987-11-03
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
351 1A, 307510, H03D 324
Patent
active
047047224
ABSTRACT:
Prior art circuits for recovering timing information from baseband digital signals include a rectifier and a separate phase detector for controlling the phase of a phase-locked voltage-controlled oscillator. In the circuit described herein, an antiparallel diode pair is used to perform the two functions of rectification and phase detection. The resulting timing circuit is, thereby, simplified. Alternatively, a dual-gate field effect transistor may be used.
REFERENCES:
patent: 3209261 (1965-09-01), Critchlow
patent: 3311442 (1967-03-01), Jager et al.
patent: 3493868 (1970-02-01), Hackett, Jr.
patent: 3654564 (1972-04-01), Tisi et al.
patent: 3742372 (1973-06-01), Uchida et al.
patent: 3800231 (1974-03-01), Pratt
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patent: 4162446 (1979-07-01), Cochran
patent: 4276650 (1981-06-01), de Jager et al.
patent: 4464771 (1984-08-01), Sorensen
patent: 4527080 (1985-07-01), Zweig
patent: 4546275 (1985-10-01), Pena-Finol et al.
Floyd Gardner, "Phaselock Techniques", 1966 John Wiley Son Inc., pp. 116-119.
American Telephone and Telegraph Company AT&T Bell Laboratories
Chin Stephen
Griffin Robert L.
Laumann Richard D.
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