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

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

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...