Re: Choosing voltage opamp

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#2063

From: David L. Jones
Date: Sun, 24 Sep 2006 07:30

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Dana wrote:
> "Vitaliy" <vmykhayl@ee.ryerson.ca> wrote in message
> news:1159055088.803133.110670@m7g2000cwm.googlegroups.com...
> > Hi David,
> >
> > Is the maximum Vp-p I can get from an opamp with +/-5V rails 5V then?
> > I know I measured the output of transimpedance amplifier and I was
> > getting maximum ~8Vp-p :confused:
> >
> > Vitaliy
> >
> > David L. Jones wrote:
> > > Vitaliy wrote:
> > > > Hello,
> > > >
> > > > I'm looking to add the 2nd stage to photodiode transimpedance
> > > > amplifier. All I want to achieve by 2nd stage is voltage gain and
> > > > capability to drive 50 Ohm loads. The first stage is OPA657.
> > > >
> > > > 1) a) Given power supply for opamp +-5V, should I select the opamp
> that
> > > > has Io,max=>200mA. I do expect Vpeak-to-peak,output to be 10V.
> > > >    b) Is that output current achievable only at maximum supply
> voltage,
> > > > or as long as
> > >
> > > You won't get 10Vp-p output from an opamp with +/-5V rails, you need a
> > > larger supply voltage.
> > >
> > > Dave :)
>
> Are you sure about that.
> Assume you have a  1k resistor on the inverting input in series with the
> incoming signal. On the feedback line from the output back to the input you
> have a 10k res, and on the non inverting input you have a 1k (909ohm
> resister if you do the math).
> With an input  sinewave of 1 volt at 1ma you will have a 10v p-p output

Not with +/-5V rails he won't.

Dave :)

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From: "David L. Jones" <altzone@gmail.com>
Newsgroups: sci.electronics.design,sci.electronics.basics,aus.electronics
Subject: Re: Choosing voltage opamp
Date: 24 Sep 2006 00:30:15 -0700
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