A cycle slip suppression circuit for pll frequency synthesizer
A technology of frequency synthesizer and suppression circuit, which is applied in the direction of automatic power control and electrical components, can solve the problems of loop influence and increase the difficulty of implementation, and achieve the effect of small influence, simple control scheme and high integration
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[0029] A charge pump type PLL frequency synthesizer generally includes a phase frequency detector (PFD) 10 , a charge pump 12 , a loop filter 13 , a voltage controlled oscillator 14 and a frequency divider 15 . The input terminals of the PFD are Fref and Fdiv, and the output terminals are UP and DN respectively. The PFD compares the frequency and phase of the input reference signal Fref and the feedback signal Fdiv, and then outputs two signals of UP and DN to select different charging and discharging. The current value CPout is sent to the loop filter, and the loop filter performs low-pass filtering according to the charging and discharging current value CPout output by the charge pump, and then generates a DC voltage and sends it to the voltage-controlled oscillator. The sent DC voltage generates a corresponding output frequency to the frequency divider; the frequency divider divides the output frequency of the voltage-controlled oscillator and feeds it back to the input term...
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