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Measure Loopgain, PSRR

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bicave

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Hi! I don't know how to measure Loopgain, PSRR of error amplifier. Could you give me some guide or suggestion?
What is best value for PSRR in db? how to change it?

thanks
 

if u r using spectre the break the loop and put the source and measure the loop gain by clicking on the ac analysis.
and for measureing the psrr put the ac source on vdd and measur the gain at the output wiill be ur psrr by vdd and do the same for vss.
if u r using the hspice then use middle brook method to measure the loop gain,
and put the ac source on vdd and measure the gain at output.
hope this helps.
manish'
 

Hi,
For measuring loop gain, first break the loop, then perform either ac or stb analysis.

For PSRR you can perform both XF or ac analysis.

For test setup see Aleen Hollberg

thanks
sarfraz
 

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