[sdiy] Zero gain, unity gain

[Oscar Salas]

Yes, unity gain means that level input is the same than level output.


Oscar.

--- On Sun, 4/18/10, Ingo Debus <igg.debus at t-online.de> wrote:

> From: Ingo Debus <igg.debus at t-online.de>
> Subject: [sdiy] Zero gain, unity gain, was: RC filter questions + SPICE RC filter simulation questions
> To: "synth-diy diy" <synth-diy at dropmix.xs4all.nl>
> Date: Sunday, April 18, 2010, 6:23 PM
> 
> Am 18.04.2010 um 02:11 schrieb Neil Johnson:
> 
> > Ingo Debus wrote:
> >>> "The unusual RC circuit on the rear cover
> gives a maximum voltage gain of just over 15%. Ordinary RC
> circuits give less than unity voltage gain. "
> >> 
> >> I'm lost here. Isn't a voltage gain of 15%, or
> 0.15, clearly lower than unity?
> >> 
> >> Or does he mean 1.15? This would be 115%, no?
> > 
> > A *GAIN* of 15%, or put another way 15% above 1.0, or
> put another way 1.15.
> 
> So gain is defined as what is gained with respect to unity
> gain?
> In other words, unity gain is no gain? ;-)
> 
> Well even The Art Of Electronics uses the term gain
> loosely. In their chapter on operational amplifiers voltage
> gain is defined as Vout/Vin (p. 178). But explaining the
> emitter follower they say "it has no voltage gain" (p. 65).
> 
> Ingo
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