The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Date: Mon, 30 Sep 2002 21:25:29 +0200
From: Hugo Coolens
X-Mailer: Mozilla 4.78 [en] (X11; U; Linux 2.4.3-20mdk i686)
Subject: Re: noise gain
References: <3D946A58.EE471A8F@skynet.be> <3D97104C.55F2C789@skynet.be>
Organization: -= Skynet Usenet Service =-
James Meyer wrote:
> On Sun, 29 Sep 2002 16:38:04 +0200, Hugo Coolens wrote:
> >May I conclude from this that the noise gain (NG) of an amplifier is defined as:
> >NG = -Vo/epsilon for Vi=0
> >(epsilon = V+ - V- )
> >and that it is both for an inverting opamp amplifier and a non inverting amplifier
> >equal to 1 + R2/R1
> A second reference that may be helpful is:
> Noise gain is equal to signal gain in an inverting configuration and
> equal to 1 + the signal gain in non-inverting configurations.
> Inverting... NG=R2/R1
> Non-inverting... NG=1+(R2/R1)
I think you mixed things (reread your second reference), in my opinion it should be:
For both the inverting and non-inverting configurations noise gain is 1+R2/R1, thus
for an inverting amplifier noise gain equals (modulus of) signal gain + 1, and for a
non-inverting amplifier noise gain equals signal gain.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup