Re: Choosing voltage opamp

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#2047

From: redbelly
Date: Fri, 29 Sep 2006 13:59

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> Jamie wrote:
> >   put an old stand by TL082 type op-amp infront of it.

Vitaliy wrote:
> But that would kill my BW (the BW on that is only 4MHz, and I need
> 40MHz), right?

> redbelly wrote:
> > If you're okay with, say 1 usec or slower response time, I wouldn't
> > worry about using a 50 ohm load.  You might even be okay with the
> > higher impendance at somewhat faster response times, you might need to
> > experiment a little.  If you could get by with a 1k or 10k load then
> > you'd have an easier time finding an opamp.
> >
> > You didn't say much yet about the nature of your signal, other than
> > it's optical.  Are you looking at light pulses (and at what pulse
> > duration), modulated light (and at what frequency), or a more-or-less
> > cw signal that changes slowly in intensity (and on what sort of time
> > scale does the intensity change)?

Vitaliy wrote:
> I have broadband light source w/ rapid scanning optical delay line
> (RSOD) and phase modulator. Are you suggesting this would affect the
> required slew rate?

I was thinking in terms of bandwidth, but yes, the slew rate is
relevant also.

You'll almost certainly need a 50 ohm load at 40 MHz speed, so forget
my earlier suggestion of using a higher load to reduce the current
requirement.

Mark

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From: "redbelly" <redbelly98@yahoo.com>
Newsgroups: sci.electronics.design,sci.electronics.basics,aus.electronics
Subject: Re: Choosing voltage opamp
Date: 29 Sep 2006 06:59:03 -0700
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