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output swing of an OTA

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r@m$

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hiii....

I have to find the output swing of an OTA.

But the required specification has two limits mentioned as 600m-1.2v
I am confused..:????:
I know how to find the maximum output swing,..
BUT how can I find the lower limit of it?????
 

LvW

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Without a long brain-storming I think: lowest output amplitude is zero.
 

r@m$

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But in my circuit specifications it is given that output swing is 600mV-1.2 V

then what does it mean??
 

FvM

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If the output stage is formed by simple non-cascoded MOS current mirrors, it can acieve rail-to-rail output, with current reduction according to the MOS saturation characteristic. To calculate the undistorted ouput swing, you would need to know the transistor parameters.
 

erikl

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But in my circuit specifications it is given that output swing is 600mV-1.2 V
then what does it mean??

I think this means the OTA should achieve a linear ("undistorted") output range between these 2 given limits. Instead of a max. distortion level value, also a (-)3 or 6dB OTA gain drop could define such output range limits. Additionally, the output load should be specified.
 

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