Loop filter modulated synthesizer

Details Loop filter modulated synthesizer Loop filter modulated synthesizer

1989-04-28

1990-08-28

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 23, 332144, 455113, 455119, H03C 309, H03L 7093

Patent

active

049528890

ABSTRACT:
A frequency synthesizer for providing a modulated output signal includes a phase comparator, a loop filter, and a voltage controlled oscillator (VCO). The phase comparator receives a reference input signal and a signal related to the VCO output, and generates a control current. A modulation circuit receives a modulation signal and provides both a modulation current and a modulation voltage. The modulation current is summed with the control current at one input of the loop filter, while the modulation voltage is applied to a second input of the loop filter. The VCO is controlled by the output of the loop filter to produce the modulated output signal.

REFERENCES:
patent: 4052672 (1977-10-01), Enderby et al.
patent: 4559505 (1985-12-01), Suarez et al.
patent: 4649353 (1987-03-01), Sonnenberg
patent: 4755774 (1988-07-01), Heck
Gardner, Phaselock Techniques 2nd Edition, 1979, pp. 166 and 167.

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