Why it is called DC-Gain, while doing AC analysis

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lsdee

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Why it is called DC-Gain, while doing AC analysis in Cadence？

I was confused.

What is the definition of DC gain?

And why we could get it from the AC analysis in Cadence？
 

Why it is called DC-Gain, while doing AC analysis&#65311

I'd guess just sloppy expression. Though your small signal
gain, extrapolated back to 0 Hz, should match a true DC gain.

Maybe "Gain at a sufficiently low frequency that it is the same
as DC" doesn't roll so trippingly off the tongue.
 

DC Gain implies Gain at 0 frequency.
We know that,
Gain Bandwidth Product = DC Gain * 3dB BW = 0dB gain * UGB (Unity Gain BW)

May be from this expression, the term DC gain might have arrived. Just a guess...:|
 

AC analysis is not run point by point in time domain. It's frequency sweep based on transfer function or in freqency domain. DC gain when f=0.

You don't have to get it from AD analysis. You may get from other analysis but you'll find it takes longer time especially when you want to compare different frequecies.

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lsdee said:
Why it is called DC-Gain, while doing AC analysis in Cadence？

I was confused.

What is the definition of DC gain?

And why we could get it from the AC analysis in Cadence？
Click to expand...
 

you may also call it "low frequency gain" as Gray and Meyer.
 

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