Frequency adjusting method of oscillator and decimal fraction frequency dividing phase-locked loop frequency synthesizer
A frequency synthesizer and frequency adjustment technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of long time for VCO frequency adjustment, achieve the effect of effectively approximating the target value at high speed and speeding up the self-calibration process
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[0019] Below in conjunction with accompanying drawing and example further illustrate the present invention.
[0020] figure 1 Shown is a system composition of a voltage-controlled oscillator with a switched capacitor array and a fractional frequency phase-locked loop frequency synthesizer with frequency self-calibration function. The fine-tuning mechanism of the analog phase-locked loop includes a phase-frequency detector, a charge pump, a loop filter, a voltage-controlled oscillator VCO with a switched capacitor array, a frequency divider, a frequency-division modulator and a reference frequency generation circuit, wherein , the frequency and phase detector, charge pump, loop filter, voltage controlled oscillator and frequency divider are connected in turn to form a loop, and the reference frequency is input into the frequency and phase detector; the frequency division modulator and The frequency dividers are connected so that the frequency divider is controlled by the freq...
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