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INA333 EMG Instrumentation Amplifier
I need some help regarding the simulation model of INA333.
i need to make a PCB design of my circuit which is using INA333. I have made my simulation in TINA-TI simulation software. Now, the thing is that I want a PCB Design for which I will have to use PSpice A/D in OrCAD. There is a Text Document "Instrumentation amplifier SPICE MACROMODEL" available for PSpice at the www.ti.com website. But I have been trying and am not able to run that *.txt file in the PSpice A/D software. Can anybody please help me on that. I am not very used to using PSpice/OrCAD =(
To answer your question correctly, I need more information. Yes, with a 3.6V V+, the output can swing to 3.3V - but that depends upon the load. What is the load that the INA is driving?
You say 10-15mV signal is on Vin+; what is on Vin-? What is V-? (I assume it's zero since you said it's "single supply").
I also need to know what your common mode voltage is so we can make sure that it's not going to cause any internal nodes to saturate).
Can you post your proposed schematic around the INA333?
the ina333 is taking its input from
I attached the file which Icurrently have made in the above post. Its a "TINA schematics diagram" of the circuit which i have made up till now , and it is dual-supply based. It has "Vin -" grounded, and "V-" and "V+" can be attached to +/-1.8V each.
What i basically need is to make it single supply, with a single battery of 3.6V being used at supply only. the input signal would be the same probably, because im basically testing it to be compatible with an EMG sensor, which would give 10mV on average to the "Vin+" of this INA333 instrumentation amplifier.
Ask me if u want more information. cheers.
You might want to review this discussion in the Precision Amplifier forum. It's from someone trying to do something similar.
I hesitate to give you a recommended circuit without knowing all the details about your sensor. Contact impedances and offsets can severely limit the amount of gain you can put at this stage. If reading the linked article doesn't answer your question, then I'd suggest getting all the details on your sensor together and posting a question in the Precision Amplifiers forum and see what the apps guys there have to recommend.
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