output swing of an OTA

[r@m$]

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]

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

 

[r@m$]

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

then what does it mean??

 

[FvM]

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]

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.