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Difference between PM frequency from stb and result fromcalculato？

zuiying over 1 year ago

Hello，I am using stb to simulate my OTA. The schemetic is as follows.

The setting in stb and simulation results are as follws.

I want to know unity gain bandwidth. I direct plot the PM frequency and it tells me 6.899MHz.

But when I use calculator to calculate the the zero crossing point of the gain curve，it tells me 7.512MHz.

This two values is not very close. Which one is correct or more accurate? Thank you!

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Lahsiv902 over 1 year ago

Use the calculator for the unity gain frequency. The built-in function for unity gain frequency is not accurate.

The PM value from the stb analysis report is more accurate.
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zuiying over 1 year ago in reply to Lahsiv902

Thank you!
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zuiying over 1 year ago in reply to Lahsiv902

Thank you!
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