Frequency synthesizer with frequency modulated output

Details Frequency synthesizer with frequency modulated output Frequency synthesizer with frequency modulated output

1977-05-16

1978-10-10

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 16, 332 19, 331 32, H03B 304

Patent

active

041199251

ABSTRACT:
A frequency synthesizer having a frequency-locked loop providing any digitally selected output frequency, and means to frequency modulate the selected output frequency at an audio rate. The frequency-locked loop includes a frequency-to-current converter coupled to the output of a voltage-controlled oscillator to provide a current, representing the actual frequency of the oscillator, which is compared with a current representing a desired output frequency. A resulting error signal controls the oscillator center frequency, which can be frequency modulated by an audio-frequency signal.

REFERENCES:
patent: 3735276 (1973-05-01), Apolant
patent: 4052672 (1977-10-01), Enderby et al.

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