Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1983-12-30
1993-11-02
Barron, Jr., Gilberto
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 10, 331 25, 328 14, H03L 722, H03B 1900
Patent
active
052587240
ABSTRACT:
The fractional division frequency synthesizer comprises a digital ramp generator producing a digital correction ramp controlled by a frequency control programmer; a divide by N divider coupled to an output of a voltage controlled oscillator with the divider being controlled by the program, where N is a selected one of an integer and a fraction one or greater; a digital phase detector coupled to a reference clock and the output of the divider to provide a digital phase error signal; a digital adder coupled to an output of the ramp generator and the phase detector to produce a ramp corrected digital phase error signal; and circuit arrangement coupled to an output of the adder and a control input of the controlled oscillator to convert the ramp corrected digital phase error signal to a ramp corrected analog phase error signal to control the controlled oscillator and thereby provide a controlled frequency signal at the output thereof.
REFERENCES:
patent: 3382451 (1968-05-01), Gillette et al.
patent: 3555446 (1971-01-01), Braymer
patent: 3582810 (1971-06-01), Gillette
patent: 3628160 (1971-12-01), Pickering
patent: 3689914 (1972-09-01), Butler
patent: 3959737 (1976-05-01), Tanis
patent: 4069452 (1978-01-01), Conway et al.
patent: 4472820 (1984-09-01), Borras
"Frequency Synthesis in a Microwave Signal Generator", K. L. Astrof, Hewlett Packard Journal, Nov. 1977, pp. 8-15.
"A High-Purity, Fast Switching Synthesized Signal Generator", R. Hassun, Hewlett Packard Journal, Feb. 1981, pp. 3-7.
"Digital Control for a High-Performance Programmable Signal Generator", H. C. Chisholm, Hewlett Packard Journal, Feb. 1981, pp. 8-11.
Lu Ning H.
Schenberg Alan N.
Tanis William J.
Barron Jr. Gilberto
Hogan Patrick M.
ITT Corporation
Twomey Thomas N.
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