OTA Integrators: Choosing the Right One for You

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SUMMARY

This discussion focuses on the selection of Operational Transconductance Amplifiers (OTAs) for integrating analog signals, particularly in the context of dual slope Analog-to-Digital Converters (ADCs). Users are advised to consider traditional solutions like the Miller Integrator due to the limitations of OTAs, such as their inability to drive resistive loads. Specific OTA models mentioned include LM13600, LM13700, and OPA series amplifiers, which are typically used as internal components in integrated circuits rather than off-the-shelf products.

PREREQUISITES
  • Understanding of Operational Transconductance Amplifiers (OTAs)
  • Familiarity with Miller Integrator design
  • Knowledge of dual slope Analog-to-Digital Converters (ADCs)
  • Experience with analog signal processing
NEXT STEPS
  • Research the specifications and applications of LM13600 and LM13700 OTAs
  • Study the design and implementation of Miller Integrators
  • Learn about the limitations of OTAs in driving resistive loads
  • Explore the OPA series operational amplifiers for analog signal integration
USEFUL FOR

Electronics engineers, circuit designers, and anyone involved in analog signal processing and ADC integration will benefit from this discussion.

salil87
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Hi
What kinds of OTA integrators are available and how should i decide which to use?
Thanks
Salil
 
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What are you trying to integrate?
Why do you need to use an OTA?
How will you trigger a reset?
 
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
 
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.
 
salil87 said:
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.
 
analogdesign said:
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,
 
Last edited:
Well I certainly stand corrected!
 

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