rickman wrote in :

The entire power
budget is a couple hundred microwatts.

There's a tiny Texas Instruments one that might do it, very cheap too.
TLV2341, uses as little as 17µA single rail supply at up to 8V. I didn't use
it because it wasn't fast enough for what I bought it for, but it might be
worth trying for MSF signals.

On 10/29/2014 7:05 AM, Lostgallifreyan wrote:
rickman wrote in :

The entire power
budget is a couple hundred microwatts.

There's a tiny Texas Instruments one that might do it, very cheap too.
TLV2341, uses as little as 17µA single rail supply at up to 8V. I didn't use
it because it wasn't fast enough for what I bought it for, but it might be
worth trying for MSF signals.

GBW is only 0.79 MHz @ 3V Vdd, so I could only get a gain of... well not
much at 60 kHz. For an opamp to work as an opamp it needs to have
significant gain over the BW in use. I suppose I could use it open
loop, but then it would act as a low pass filter with a high gain and a
very low corner frequency.

--

Rick

rickman wrote in :

GBW is only 0.79 MHz @ 3V Vdd, so I could only get a gain of... well not
much at 60 kHz.

True, I looked at it more earlier this evening, at 3V supply you'd be lucky
to get much more than a gain of 40 I think, so some specific and discrete
transistor fix might be best.

rickman wrote in :

For an opamp to work as an opamp it needs to have
significant gain over the BW in use.

Ok, how about just enough gsain to get a buffered output of some oomph to
survive integration to slow clean pulses? That might not take so much to do,
and if it works, it really takes the strain off the real gain stage
which follows it because that will be operating pretty much at DC capability.