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PLL Simulation (Read 4358 times)

karachite

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PLL Simulation
Feb 14^th, 2007, 9:21pm

i am planning to design a PLL. i dont have access to RF spectre type of advanced simulation softwares. now how can i estimate the noise contributions of VCO, divider, and phase detector. i have access to ORCAD schematic capture and pspice simulator.

i am wondering how PLL's were design before the advent of advanced simulation softwres.

this website is wonderful.

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Visjnoe Senior Member Offline Posts: 233	Re: PLL Simulation Reply #1 - Feb 15^th, 2007, 11:33am Dear Karachite, I think you can only simulate PLL functionality (e.g. locking) given your tool set. To evaluate phase noise, try to find some equations for the phase noise of your VCO and CP, as these will be the major contributors to the overall phase noise. Kind Regards Peter
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fonseca.ha Junior Member Offline Posts: 28 UK	Re: PLL Simulation Reply #2 - Mar 7^th, 2007, 9:49am Hi I agree with the above. The resistor in the loop filter may also play an important role in phase noise, depending on VCO gain, bandwidth and area of your design, REgards, Humberto
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DaveB Junior Member Offline Posts: 15	Re: PLL Simulation Reply #3 - Mar 8^th, 2007, 4:29pm If you have Excel, I have a spreadsheet that might take care of some of your requirements. You can download it at http://www.keystoneradio.com/?n=Main.PLLDesign I've used some VBA, so you might get a security alert when you run it. Dave
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