🚀 go-pugleaf

"David L. Jones" <altzone@gmail.com> wrote in message
news:1159083015.452886.300660@b28g2000cwb.googlegroups.com...
>
> 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.

So help me out here. If he has 5 and -5 rails, , and an input sinewave comes
in, so lonag as the op amp is properly biased, will not the output swing
between 5 and -5 (not exactly 5 do to loss), in essence giving a 10vpp
signal depending on how the output is referenced to ground.
>
> Dave :)
>