🚀 go-pugleaf

"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
>