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Design >> Analog Design >> units of PSD
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Message started by singh on Jan 19^th, 2012, 5:36am

Title: units of PSD
Post by singh on Jan 19^th, 2012, 5:36am

hello,

i was going through a paper for noise calculation the circuit. I have atached the expression below.

I am just little bit confusing with the units of PSD in terms of Amp^2/Hz

the expression has KF which is unitless
Cox is Farad/length^2
Wl gives unit of length^2
and freqency is Hz
gm2 is siemesn2

if i do calculation, i am left with unints siemen^2/ (Farad* Hz)

first combination of units of gm/C gives current hence Ampere..but now thr is only gm left in expression.

so how it is ampere^2 /Hz in formula for PSD?

Title: Re: units of PSD
Post by raja.cedt on Jan 19^th, 2012, 6:08am

No...Kf has units (amp^2^farad)

Thanks,
raj.

Title: Re: units of PSD
Post by singh on Jan 19^th, 2012, 6:16am

thanks raja :)