Fractional N-frequency synthesizer and spurious signal cancel ci

Details Fractional N-frequency synthesizer and spurious signal cancel ci Fractional N-frequency synthesizer and spurious signal cancel ci

1997-07-24

1998-10-06

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 16, 331 17, 331 25, H03L 7197

Patent

active

058183035

ABSTRACT:
A fractional N-frequency synthesizer includes an accumulator outputting an output value, and a spurious signal cancel circuit. The spurious signal cancel circuit includes a pulse forming circuit, receiving a spurious signal cancelling reference signal, a reset signal and the output value of the accumulator, and outputting, in synchronism with the spurious signal cancelling reference signal, a pulse voltage signal having a pulse width proportional to the output value of the accumulator from a time when the reset signal is received, and a constant current circuit controlled by the pulse voltage signal and outputting an output current of the spurious signal cancel circuit.

REFERENCES:
patent: 4586005 (1986-04-01), Crawford
patent: 5180993 (1993-01-01), Dent
"High Speed Switching Fractional-N Synthesizer Using Phase Error Compensation Scheme with Controlling Pulse Width", Hirata et al, Technical Report of IEICE, RCS95-119, (Jan. 1996), pp. 51-55.

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