Fractional-division frequency synthesizer for digital angle-modu

Details Fractional-division frequency synthesizer for digital angle-modu Fractional-division frequency synthesizer for digital angle-modu

1982-08-17

1985-01-08

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

328 14, 332 16R, 375 62, 375 67, 455112, 455113, H03C 306, H04B 104

Patent

active

044929366

ABSTRACT:
In order to deliver an angle-modulated output signal as a function of digital information, the frequency synthesizer delivers an output frequency F.sub.S =(N+k)F.sub.R, where N is the integral part of a number N+k and F.sub.R is a reference frequency. Provision is made for a variable oscillator, an oscillator control loop comprising in series a variable divider having a preselected divisor N, a phase comparator for receiving the reference frequency and a summing device. The synthesizer further comprises a phase accumulator for performing, at the frequency F.sub.R, modulo-M summation of a number G=k(M) applied to its input. The sum and carry outputs of the accumulator are coupled respectively to the summing device in order to deliver a signal for compensating the signal delivered by the phase comparator and to the divider for delivering a control signal to select the divisor N+1. An adder having one output coupled to the input of the phase accumulator receives a constant number g on one input and a number dg which is representative of the digital information on another input.

REFERENCES:
patent: 4068199 (1978-01-01), Madoff
patent: 4308508 (1981-12-01), Sommer et al.
patent: 4320361 (1982-03-01), Kikkert
patent: 4328554 (1982-05-01), Mantione
Electronic Components & Applications, vol. 3, No. 1, Nov. 1980, by: P. R. Brennand et al., "Frequency Synthesiser Using LSI Devices", pp. 47-61.
Patent Abstracts of Japan, vol. 5, No. 109, Jul. 15, 1981, pp. E-65, 781.

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