Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator
Patent
1984-06-06
1986-04-01
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural a.f.s. for a single oscillator
331 11, 331 12, 331 14, 331 16, 331 17, H03L 706, H03L 710
Patent
active
045801070
ABSTRACT:
The acquisition of phase lock to a reference frequency by a signal acquisition system is accomplished using a voltage controlled oscillator, a wideband frequency discriminator, a prepositioning circuit, and a phase lock loop. The voltage controlled oscillator is prepositioned within a loop bandwidth of the reference frequency by the prepositioning circuit and the wide band frequency discriminator which provide coarse tuning. The voltage controlled oscillator achieves phase lock with the reference frequency when it receives the fine tune signal from the phase lock loop. Using both the discriminator and the phase lock loop allows fast acquisition without the need to calibrate the voltage controlled oscillator. Since the discriminator pull-in range is much larger than the phase-lock loop bandwidth, the number of bits can be much smaller than in an acquisition circuit using a digital prepositioning circuit alone.
REFERENCES:
patent: 3346814 (1967-10-01), Haggai
patent: 3421105 (1969-01-01), Taylor
patent: 3795870 (1974-03-01), Sanders
patent: 3825855 (1974-07-01), Basset et al.
patent: 3859599 (1975-01-01), Peil
patent: 4272729 (1981-06-01), Riley, Jr.
patent: 4354277 (1982-10-01), Crackel et al.
patent: 4365211 (1982-12-01), Lee
patent: 4374438 (1983-02-01), Crowley
patent: 4409563 (1983-10-01), Vandegraaf
patent: 4423390 (1983-12-01), Waters
patent: 4434407 (1984-02-01), Healey, III et al.
patent: 4511858 (1985-04-01), Charavit et al.
Caldwell Stephen P.
Decker Martin J.
Jelen Robert A.
LaRoche Eugene R.
Matthews Willard R.
Mis D. C.
Singer Donald J.
The United States of America as represented by the Secretary of
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