# Frequency divider

Started by January 18, 2003
 Hi Guys, My question has something to do with frequency multiplier and divider in a PLL. For example, before a QPSK is fed into a PLL, i have to pass the signal through a 4th power device and bandpass it. I could do this by muliplying 4 times. However, i am not sure how to divide the estimated carrier coming out from the PLL by 4 times. Does anyone knows how to implement this frequency divider? Thanks.
 Hi, You dont divide the carrier by 4 and then estimate it. Instead you estimate the new carrier (which is 4 times the original carrier) and then divide the estimate by 4. For e.g.: If your original carrier was Fc, after the frequency multiplier it will be 4*Fc. You estimate F' (~= 4*Fc) from this signal and F'/4 will be your estimate for Fc. -priyank --- "sasilion <>" <> wrote: > Hi Guys, > > My question has something to do with frequency multiplier and > divider in a PLL. For example, before a QPSK is fed into a PLL, i > have to pass the signal through a 4th power device and bandpass it. > I could do this by muliplying 4 times. However, i am not sure how to > divide the estimated carrier coming out from the PLL by 4 times. > > Does anyone knows how to implement this frequency divider? > > Thanks. > __________________________________________________
 Hi Priyank, You mention something about estimating F'(~Oc) and then F'/4 will be my estimated carrier. My problem is how to implement this F'/4 Thanks. --- In , Priyank Saxena wrote: > Hi, > > You dont divide the carrier by 4 and then estimate it. Instead you estimate the > new carrier (which is 4 times the original carrier) and then divide the > estimate by 4. > For e.g.: > If your original carrier was Fc, after the frequency multiplier it will be > 4*Fc. You estimate F' (~= 4*Fc) from this signal and F'/4 will be your estimate > for Fc. > > -priyank > > --- "sasilion " wrote: > > Hi Guys, > > > > My question has something to do with frequency multiplier and > > divider in a PLL. For example, before a QPSK is fed into a PLL, i > > have to pass the signal through a 4th power device and bandpass it. > > I could do this by muliplying 4 times. However, i am not sure how to > > divide the estimated carrier coming out from the PLL by 4 times. > > > > Does anyone knows how to implement this frequency divider? > > > > Thanks. > > > > > > __________________________________________________ >