I want to design PLL for 100Mhz. In which,how to design low pass filter?
I use PLL without charge pump.that means,output of phase detector is directly goes in input in LPF.
Is it ok?
You will need a charge pump to convert the phase detector output into a signal that can drive the VCO.
What PLL are you using?
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ADIsimPLL free download: www.analog.com/adisimpll
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