Oct 13, 2015 #1 A amsdesign Member level 3 Joined Aug 26, 2015 Messages 67 Helped 0 Reputation 0 Reaction score 0 Trophy points 6 Activity points 550 I have these two frequencies fed to the input of the PLL and need to vary the B.W according to the frequency. But before that, how do I differentiate between these two frequencies?
I have these two frequencies fed to the input of the PLL and need to vary the B.W according to the frequency. But before that, how do I differentiate between these two frequencies?
Oct 13, 2015 #2 S srizbf Advanced Member level 5 Joined Apr 3, 2010 Messages 1,992 Helped 417 Reputation 840 Reaction score 329 Trophy points 1,363 Activity points 10,985 differentiate with filters tuned to 24 and 40mhz. the o/p of the filters can be used to control the BW of PLL.
differentiate with filters tuned to 24 and 40mhz. the o/p of the filters can be used to control the BW of PLL.
Oct 13, 2015 #3 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,868 Helped 4,908 Reputation 9,839 Reaction score 5,712 Trophy points 1,393 Activity points 173,472 Hi, I'm not sure what you mean... In my eyes I think you need a MUX (CMOS switch) to select between the two frequency sources. I don't think you need to adjust pll phase detector feedback signal, but if you want to do so it is also possible with CMOS switches. Klaus
Hi, I'm not sure what you mean... In my eyes I think you need a MUX (CMOS switch) to select between the two frequency sources. I don't think you need to adjust pll phase detector feedback signal, but if you want to do so it is also possible with CMOS switches. Klaus