H - Electricity – 03 – B
Patent
H - Electricity
03
B
328/10, 328/28,
H03B 21/00 (2006.01) H03C 3/09 (2006.01) H03L 7/197 (2006.01) H04L 27/12 (2006.01)
Patent
CA 1184260
A FRACTIONAL-DIVISION FREQUENCY SYNTHESIZER FOR DIGITAL ANGLE-MODULATION Abstract of the Disclosure In order to deliver an angle-modulated output signal as a function of digital information, the frequency synthesizer delivers an output frequency FS = (N + k)FR, where N is the integral part of a number N+k and FR is a reference frequency. Provision is made for a variable oscillator, an oscillator control loop comprising in series a variable-rank divider prepositioned on the division rank 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 FR 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 at N+1 of the division rank. An adder having one out- put 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.
409438
Albarello Alain
Pimentel Alberto
Roullet Andre
Goudreau Gage Dubuc
Thomson-Csf
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