Phase locked loop frequency synthesizer including fractional dig

Details Phase locked loop frequency synthesizer including fractional dig Phase locked loop frequency synthesizer including fractional dig

1981-11-30

1984-08-28

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 17, 331 25, H03L 718

Patent

active

044686323

ABSTRACT:
An improvement in a frequency synthesizer comprising a voltage-controlled oscillator (VCO) for generating an output signal S.sub.VCO of frequency F.sub.VCO, a divider for dividing F.sub.VCO in division cycles with each division cycle consisting of the division of F.sub.VCO by N, Y times, and by (N+M), Z times, in an iterative manner to produce a divided output signal S.sub.N of frequency F.sub.N, where the division ratio is ##EQU1## and where N, Y, M and Z are integers, a reference signal generator for generating a reference signal S.sub.R of frequency F.sub.R, and a phase detector responsive to S.sub.N and S.sub.R to produce an output signal whose amplitude is representative of the phase therebetween. The improvement is a control circuit comprising logic for detecting and averaging the output signal from the phase detector during each division of F.sub.VCO in each division cycle to produce a d.c. control signal whose amplitude is substantially constant and proportional to the average of the amplitudes of the detected output signals over each division cycles. The VCO is responsive to the d.c. control signal to generate an output signal S.sub.VCO whose divided frequency F.sub.N =F.sub.R.

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Yeung, Steve, "Developments in Phase Locked Loop Tuning Systems", New Electronics, vol. 12, No. 3, (Feb. 6, 1979), pp. 64-67.

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