Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1981-01-26
1984-03-06
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
331 25, 375110, 375120, H03L 706
Patent
active
044356870
ABSTRACT:
An absolute differentiator receives a self-clocking digital input signal, and its output is applied to a series of delay elements. The outputs of the differentiator and the delay elements are coupled to an OR-gate. The output of the OR-gate is applied to a phase-locked loop to produce a recovered clock signal. The delay elements can be variable with a delay controlled by an output signal from the phase-locked loop, to thereby track a varying center frequency of the digital input signal.
REFERENCES:
patent: 3491202 (1970-01-01), Bailey et al.
patent: 3558824 (1971-01-01), Ogawa et al.
patent: 3654564 (1972-04-01), Tisi et al.
patent: 4010323 (1977-03-01), Peck
Carasso Marino G.
Kenney, II George C.
Nadan Joseph S.
Briody Thomas A.
Goodman Edward W.
Grimm Siegfried H.
North American Philips Corporation
Streeter William J.
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