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ppm detector (Read 2198 times)

supermoment

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ppm detector
Jul 11^th, 2010, 8:33pm

I got a phase loop for random data running at 5GHz 200ps. Because the BW is only around 4MHz, the ppm detector got to be around 0.2ps resolution or +/-800ppm. (correct me if i am wrong).

the structure is 5GHz clk following by a divider32(156.25MHz or 6.4ns) and then a counter with N bits. The 156.25MHz is used due to the clkref in the freq loop.

To achieve the resolution -->200ps/2048 = 0.1ps (500ppm)

The one cycle of ppm detector will be 6.4ns x 2048=13.1us!!

How could I simulate this in spectre?
Unless i use higher freq clk to the counter.

Is the above statement correct??

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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: ppm detector Reply #1 - Jul 14^th, 2010, 7:05pm Hi Casual, I don't understand what your circuitry is going to do. What does ppm mean in your scenario? By the way, I think your question should be posted in design section, like mixed signal design or high speed communication. Yawei
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supermoment Senior Member Offline Posts: 167	Re: ppm detector Reply #2 - Jul 27^th, 2010, 12:29am It is a freq detector that have capability to set ppm (part per million) of a freq. I posted in the analog forum but moderators shifted it to here.
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