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lsdee
Joined: 04 Oct 2009
Posts: 2
Location: Canada
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 01 Nov 2009 23:26 Why it is called DC-Gain, while doing AC analysis |
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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？
Last edited by lsdee on 02 Nov 2009 3:23; edited 1 time in total |
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dick_freebird
Joined: 04 Mar 2008
Posts: 313
Helped: 46
Location: USA
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02 Nov 2009 1:58 Why it is called DC-Gain, while doing AC analysis？ |
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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.
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lsdee
Joined: 04 Oct 2009
Posts: 2
Location: Canada
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02 Nov 2009 3:53 Why it is called DC-Gain, while doing AC analysis |
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| And is there any connection between that "DC" and "AC"?
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jesseyu1984918
Joined: 16 Jun 2008
Posts: 13
Helped: 1
Location: Singapore
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02 Nov 2009 9:51 Why it is called DC-Gain, while doing AC analysis |
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| DC means no capacitance and inductance while AC have
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master.ckt.breaker
Joined: 02 Nov 2009
Posts: 12
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03 Nov 2009 7:53 Re: Why it is called DC-Gain, while doing AC analysis |
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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...
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vistapoint
Joined: 20 Feb 2005
Posts: 91
Helped: 2
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04 Nov 2009 15:25 Re: Why it is called DC-Gain, while doing AC analysis |
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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 wrote: |
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？ |
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| Back to top |
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edafisher
Joined: 25 Dec 2004
Posts: 16
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09 Nov 2009 1:27 Re: Why it is called DC-Gain, while doing AC analysis |
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| you may also call it "low frequency gain" as Gray and Meyer.
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