Will this produce a sinusoidal output, or a square wave (and/or TTL) output? A quick Google search turns up stuff that would output a square wave. It is extremely important that my final signal be a very pure 10 MHz sine wave. I could use a narrow bandpass filter on the output of a divide by 20 counter, but I'm not it would do the trick. (Edit: Also, I'm not positive, but I think using a bandpass filter could add a signficant phase shift to the output... this is something I can look up, though.)You can just use a divide by 20 counter.
The output can be anything you want. You can hi-pass filter it for make a sinewave, or you can use a wave shaper. A PLL can shift the phase to make up for any lag due to filtering. In fact, some PLL's include the pre-scaler and post-scaler ( which are nothing more than the counter I mentioned ) as an integrated function.Will this produce a sinusoidal output, or a square wave (and/or TTL) output? A quick Google search turns up stuff that would output a square wave. It is extremely important that my final signal be a very pure 10 MHz sine wave. I could use a narrow bandpass filter on the output of a divide by 20 counter, but I'm not it would do the trick. (Edit: Also, I'm not positive, but I think using a bandpass filter could add a signficant phase shift to the output... this is something I can look up, though.)
There will be phase shift in the frequency divider that is difficult to compensate for.The output can be anything you want. You can hi-pass filter it for make a sinewave, or you can use a wave shaper. A PLL can shift the phase to make up for any lag due to filtering. In fact, some PLL's include the pre-scaler and post-scaler ( which are nothing more than the counter I mentioned ) as an integrated function.
Sure, but 200MHz is a 5nS period. Even if you use an ECL divider, the propagation delay is a significant portion of the period.Well, you can always synchronize the output of the divider with the input signal. The phase shift in that case will be one propagation delay.
Thanks for the reply. So you would recommend doing the phase detection at lower frequency. I imagine phase detectors in general do a better job at lower frequencies, so that makes sense.The two inputs to my phase detector would be oscillator 200MHz/20=10MHz, and VCO 210MHz/21=10MHz.
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Jake Hertz