OTA design - slew rate measurement

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poonamagale

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Hi!,
We have just designed a 2 stage OTA with a cascoded differential pair as the first stage and a common source amplifier as the second stage. The gain is 59.3dB and we need to measure the slew rate. Can anyone please tell me how to go about measuring the slew rate?
The method that we were using is to supply a 1Vpp pulse at the input and using the calculate in cadence to measure the slew rate.
Is this method correct?

Thanks!,
Poonam
 

Hello

connect the OTA as a unity gain buffer (the output connected to the Vin-), apply a large pulse voltage like 1VP-P the measure the slew rate from the output. you can use the calculator to calculate it directly
the important thing is that your step input voltage should be in the range of the input common mode range of your amplifier.

you can also measure the total settling time in the same time as it need the same configuration
 

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