Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1993-07-14
1994-08-23
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 1A, 331 25, 331 34, H03L 708, H03L 7081, H03L 7093, H03L 720
Patent
active
053411102
ABSTRACT:
A phase-locking oscillator circuit having improved phase noise characteristics is disclosed herein. The oscillator circuit includes a tuned oscillator for providing a carrier signal at a tunable carrier frequency. The carrier signal is applied to an input port of a phase modulator operative to impress an RF signal upon output terminal. An error detection and feedback network generates an error signal by comparing a predefined characteristic of the RF output signal to a reference signal. The network includes a loop filter arrangement which operates upon the error signal so as to provide a tuned oscillator tuning signal to a tuning port of the tuned oscillator and a modulator control signal to a control port of the phase modulator. In an exemplary implementation the error detection and feedback network includes a phase detector for generating the error signal in response to the phase difference between the RF output signal and the reference signal.
REFERENCES:
patent: 4325032 (1982-04-01), Gilden
patent: 4862104 (1989-08-01), Muratani et al.
patent: 4987386 (1991-01-01), Poklemba et al.
"Ultrahigh Speed Phase/Frequency Discriminator" (AD 9901), Communications Products (pp. 4-115 to 4-121), no author, not dated; Product Specifications.
F. M. Gardner, Phaselock Techniques, 2nd ed., John Wiley and Sons, New York, 1979 (pp. 8 and 9), "Loop Fundamentals".
Section VIII, Analog Devices, Inc., "Frequency Domain Functions: Phase Locked Loops"; pp. VIII-1 to VIII-20, no author, not dated; Use of AD 9901.
Mis David
Watkins-Johnson Company
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