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OTA as integrator

by salil87
Tags: integrator
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salil87
#1
Sep18-13, 04:22 AM
P: 27
Hi
What kinds of OTA integrators are available and how should i decide which to use?
Thanks
Salil
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Baluncore
#2
Sep18-13, 06:38 AM
Sci Advisor
Thanks
P: 1,957
What are you trying to integrate?
Why do you need to use an OTA?
How will you trigger a reset?
salil87
#3
Sep18-13, 08:41 AM
P: 27
I am integrating the Analog signal for a dual slope ADC. But since the input is a large signal won't the gm vary with the input level?
Thanks
Salil

Baluncore
#4
Sep18-13, 02:26 PM
Sci Advisor
Thanks
P: 1,957
OTA as integrator

The traditional solution would be a Miller Integrator.
See; http://en.wikipedia.org/wiki/Operati...ing_integrator
analogdesign
#5
Sep19-13, 04:13 PM
P: 535
I'm not sure you can buy OTAs off-the-shelf... I think they are only useful as internal components in an IC. The problem with an OTA is while you can implement simpler integrators with them in theory, they can't drive resistive loads and are therefore less interesting in practice.
analogdesign
#6
Sep19-13, 04:14 PM
P: 535
Quote Quote by salil87 View Post
I am integrating the Analog signal for a dual slope ADC. But since the input is a large signal won't the gm vary with the input level?
Thanks
Salil
Yes. That's way people usually use op amps for this type of thing. See Baluncore's post. You want to use a Miller Integrator.
Baluncore
#7
Sep19-13, 04:52 PM
Sci Advisor
Thanks
P: 1,957
Quote Quote by analogdesign
I'm not sure you can buy OTAs off-the-shelf ...
Look at
LM13600, LM13700, CA3080, CA3280, LM3080, CA3094, LT3469,
OPA460, OPA461, OPA660, OPA661, OPA860, OPA861, OPA2662
NE5517, MAX435, MAX436, NT996,
analogdesign
#8
Sep19-13, 04:57 PM
P: 535
Well I certainly stand corrected!


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