Hi JR, you can use the AD9901 capable of directly comparing phase/frequency inputs up to 200 MHz
http://www.analog.com/en/prod/0%2C2877%2CAD9901%2C00.html or the Hittite HMC439QS16G http://www.hittite.com/product_info/product_specs/dividersdetectors/h mc439qs16g.pdf 73 Bruno, I6YPK http://www.qsl.net/i6ypk --- In [email protected], "jr_dakota" <[EMAIL PROTECTED]> wrote: > > That's the max frequency of the divider circuits, the phase comparator > works at a much much lower frequency after division of both the > reference and the VCO ... > > What we are looking at is a 1 to 1 phase comparison (no divders) up to > 50-60Mhz ... for example set the DDS at 30 mhz and the VCO tracks at > 30Mhz so the phase comparator works for both signals at 30 Mhz > > JR > > --- In [email protected], F6EHJ <[EMAIL PROTECTED]> wrote: > > > > Hi JR, > > > > Look at the MC145170, 185 MHz is the upper limit with 500mV at its > input. > > Not too much easy to speak with it... > > > > Best regards, > > > > Gérard/F6EHJ > > > > jr_dakota a écrit : > > > > >Given the State of the Art, 50Mhz phase detectors are probably > > >possible fairly easily.... > > > > > >Problem is everything commercial is geared for 900Mhz cellphones, > > >gigahertz broadband wireless, etc and it's not possible at those > > >frequencies (yet) for 1 on 1 phase comparison. The 50Mhz and under > > >market is way too small to make anyone want to develop such an IC ... > > > > > >JR > > > > > >--- In [email protected], "sis108" <[EMAIL PROTECTED]> wrote: > > > > > > > > >>I often wondered why you couldn't use a 1x VCO and phase detctor. > > >> > > >>IE DDS 50-60Mhz out VCO 50-60MHZ both phase detectors 50-60mhz in. > > >>Hopefully the loop filter would kill the spurs. > > >> > > >>I have not found high speed phase/freq detectors however. > > >> > > >>Anyone have an opinion on how well this might work to kill the spurs? > > >> > > >> > > >>--- In [email protected], KY1K <[EMAIL PROTECTED]> wrote: > > >> > > >> > > >>>Has any amateur ever done a DDS in conjunction with a PLL to > clean up > > >>>spurs? I hear chatter about it working well if the PLL is designed > > >>>properly, but have never run across any real life examples of the 2 > > >>>technologies rolled into one. > > >>> > > >>>I understand the DDS has advantages, especially in it's ability to > > >>>change frequency quickly. But, if rapid qsy's are not needed, I > would > > >>>think a PLL with a slow response time in the filter would be as good > > >>>or better with respect to spectral purity than any DDS available > > >>> > > >>> > > >today. > > > > > > > > >>>Appreciate any pointers to web resources discussing this topic. > > >>> > > >>>Thanks, > > >>> > > >>> > > >>>Art > > >>> > > >>> > > >>> > > > > > > > > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > >------------------------------------------------------------------ --------------------- > > >Wanadoo vous informe que cet e-mail a ete controle par > l'anti-virus mail. > > >Aucun virus connu a ce jour par nos services n'a ete detecte. > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
