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Newsgroups: sci.electronics.basics
Date: Tue, 2 Oct 2012 12:54:16 -0700 (PDT)
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Subject: Re: BJT Amplifier Output Votlage Swing
From: panfilero <panfil...@gmail.com>
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On Tuesday, October 2, 2012 11:19:15 AM UTC-5, k...@att.bizzzzzzzzzzzz wrote:
> On Tue, 2 Oct 2012 08:02:21 -0700 (PDT)
> 
> wrote:
> 
> 
> 
> >I'm having a hard time understanding the "negative swing" of a common-emitter amplifier.  There is a website called thesignalpath.com where a BJT amplifier is described.
> 
> >
> 
> >The set up is a BJT with a collector resistor, an emitter resistor, 2.5V and -2.5V supplies, and we're taking the output off the collector.  The BJT has a Vce,sat = 0.2V  According to the website
> 
> >
> 
> >maximum Vout = Vdd
> 
> >positive swing = VRc
> 
> >minimum Vout = -2.3V + VRc
> 
> >negative swing = Vce - 0.2V
> 
> >
> 
> >I understand the first three things, but the last one, negative voltage swing has me confused... why is the negative voltage swing defined as Vce - Vce,sat?
> 
> >
> 
> >here's a link to the source
> 
> >
> 
> >http://thesignalpath.com/blogs/2012/09/23/tutorial-on-the-theory-design-and-characterization-of-a-single-transistor-bipolar-amplifier/#comments
> 
> 
> 
> What they're trying to say is that the negative swing is |VCC- - VCEsat|, or
> 
> the magnitude of the negative swing is the negative supply minus the
> 
> saturation voltage.

so you think it's just a typo? That he really meant Vcc - Vce,sat and not Vce - Vce,sat?