a favorite rail-to-rail, uncompensated op-amp

[[email protected]]

Hi,

I'm looking for a rail-to-rail op-amp with compensation pins that can
be used to set the gain bandwidth product, the catch is that it needs
to be rail-to-rail output. I have been scouring manufacturers listings
but I can't seem to come up with anything. I suppose that I could use
the CA3130 but I would obviously prefer a modern replacement.

I would be quite grateful if someone could point me in the right
direction.


PS: Just to head off well-intending readers. Yes, I'm sure that I
want to adjust the GBP rather than stabilize the amplifier with lead
or lag-lead compensation. I'm running the op-amp in a peculiar
configuration where this form of compensation should work well.

 

[D from BC]

Hi,

I'm looking for a rail-to-rail op-amp with compensation pins that can
be used to set the gain bandwidth product, the catch is that it needs
to be rail-to-rail output. I have been scouring manufacturers listings
but I can't seem to come up with anything. I suppose that I could use
the CA3130 but I would obviously prefer a modern replacement.

I would be quite grateful if someone could point me in the right
direction.


PS: Just to head off well-intending readers. Yes, I'm sure that I
want to adjust the GBP rather than stabilize the amplifier with lead
or lag-lead compensation. I'm running the op-amp in a peculiar
configuration where this form of compensation should work well.

Can you list all the manufactures you've looked at so far?
D from BC

 

[[email protected]]

Can you list all the manufactures you've looked at so far?
D from BC

So far I've tried searching through the website of the following
vendors:
Analog Devices, Linear, TI, Intersil, and National

This is not to say that I am certain that none of these vendors supply
an op-amp that would work for me, just that I wasn't able to find one
digging through their website. None of these vendors appear to
provide a "compensation pin" in their parametric search either as a
parameter or in the features column, so I had to look up each amp that
looked like it might (I assumed, perhaps incorrectly, that the
minimum stable gain of such an op-amp would be greater than one).

I think that it is more a matter of me not being able to perform an
effective search than an op-amp with these qualities actually being
particularly rare. I just don't have a good way of wading through the
hundreds of rail-to-rail op-amps that are produced for those that
offer a compensation pin.


Thanks,
Jim

 

[[email protected]]

How much gbw product are you looking for. I think most faster amps
are going to be single stage amps due to the parasitics associated
with running a compensation node outside the package. rail to rail
amps typcially have gain in the output devices, so that also needs to
be compensated...which complicates things. If you can get away
without rail to rail i'd recommend the ad8099, ad8021 or ad829...

Greg

 

[sTeeVee]

How much gbw product are you looking for. I think most faster amps
are going to be single stage amps due to the parasitics associated
with running a compensation node outside the package. rail to rail
amps typcially have gain in the output devices, so that also needs to
be compensated...which complicates things. If you can get away
without rail to rail i'd recommend the ad8099, ad8021 or ad829...

Greg








- Show quoted text -

You might want to check Burr Brown. Also, there are some discrete
operational amplifier modules that may allow you to tweek for some
very specific specs e.g. - full rail output. Good luck.
-Steve Greene