Digitally controlled analog frequency synthesizer

Details Digitally controlled analog frequency synthesizer Digitally controlled analog frequency synthesizer

2006-12-27

2009-08-04

Pascal, Robert (Department: 2817)

Oscillators

Polyphase output

C331S016000, C331S017000

Reexamination Certificate

active

07570123

ABSTRACT:
A frequency synthesizer according to the present invention digitally controls an analog oscillator to generate an analog output signal at a desired frequency. A digitizing circuit converts a feedback signal derived from the oscillator output signal to a digitized multi-phase feedback signal. A comparator compares the digitized multi-phase feedback signal to a reference signal generated by the reference signal generator to generate an error signal indicative of the phase error in the output signal. A control circuit generates a control signal based on the error signal to control the frequency of the oscillator output signal.

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