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https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> Measuring distortion of a bootstrapped switch https://designers-guide.org/forum/YaBB.pl?num=1298224093 Message started by Nandish Mehta on Feb 20th, 2011, 9:48am |
Title: Measuring distortion of a bootstrapped switch Post by Nandish Mehta on Feb 20th, 2011, 9:48am Hello Friends, I am designing a low voltage boot strapped switch. Can any one please suggest me method to measure the distortion of that switch? I am using SPECTRE as circuit simulator. Any inputs or suggestions will be highly appreciated Regards Nandish |
Title: Re: Measuring distortion of a bootstrapped switch Post by ywguo on Mar 2nd, 2011, 6:50am Hi Nandish, Run transient simulation and do FFT. |
Title: Re: Measuring distortion of a bootstrapped switch Post by Nandish Mehta on Mar 2nd, 2011, 9:11am Hi ywguo, Sorry for asking such silly question but I am a newbie to design of analog ckts. I later found out that to measure distortion of boot strap switch I need to do DFT. However, when I designed the respective test bench I am getting another error. The single tone sinusoid in my test bench is shown as a spread of frequency in my DFT. My simulations setting information is as below: 1) Input is from ideal sinusiodal voltage source with 3 MHz freq. 2) Sampling frequency for sample and hold is 20 MHz 3) Simulation is ran for 10us 4) 1024 point DFT is calculated with rectangular window With this issue I cannot rely on the DFT for giving me accurate distortion value. Please suggest me some solution if you know. Regards Nandish Regards Nandish |
Title: Re: Measuring distortion of a bootstrapped switch Post by ywguo on Mar 7th, 2011, 1:04am Hi Nandish, Obviously you did not run the bootstrapped switch with coherent sampling. Try to search "coherent sampling" in this forum and google "coherent sampling", you could get a lot of useful message. Best Regards, Yawei |
Title: Re: Measuring distortion of a bootstrapped switch Post by Frank Wiedmann on Mar 7th, 2011, 8:19am This is exactly the subject of the link I gave him at http://www.designers-guide.org/Forum/YaBB.pl?num=1298281879/3#3. Seems like he did not understand it... |
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