Tuning circuit with frequency synthesizer using d/a converter

Details Tuning circuit with frequency synthesizer using d/a converter Tuning circuit with frequency synthesizer using d/a converter

1982-08-23

1985-08-06

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 16, 331 17, 455260, H03L 706

Patent

active

045338809

ABSTRACT:
A frequency synthesizer tuning circuit oscillator having an output signal frequency controlled by an input control signal is compared with the frequency specified by a source of data. The digital difference between the two compared frequencies comprises a multi-bit digital error signal of most and least significant bits. An error control signal for applying to the oscillator control input is derived by modulating the average pulse duration of a periodic pulse signal with the most significant bits of the digital error signal when the digital error signal is greater than a minimum frequency. The periodic pulse signal is amplitude modulated with the least significant bits of the digital error signal when the digital error is less than a maximum frequency. Both amplitude and pulse duration modulation of the periodic pulse signal occurs with the most and least significant bits of the digital frequency error signal when the frequency difference is between the maximum and minimum frequencies.

REFERENCES:
Penner, L. "Digital Television Tuner Uses MOSLSI and Nonvolatile Memory", Electronics, Apr. 1, 1976, pp. 86-90.

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