Hi,
I thought that telescopic cascode amplifier is not suitable for unity buffer configuration rather than folded cascode. Can you tell me any rail to rail opamp configuration which i can use for high voltage swing unity buffer design
Did you set the DC levels of the op-amp... correctly?
Hi Kenambo,
How can i change the dc-levels of the output because as far as i know, i can only change the W/L ratio of the output to control overdrive voltages of output transistor. However, i need to control VDS of output transistors so that at quiescent operating point VDS becomes equal to common mode input voltage. Any suggestions how to control VDS?
Hi viper,
Actually it is not good to set output voltage in this cascode pair configuration.... Because it makes it difficult to set vds of the botom N mos pairs... So quiescent operating points are difficult to achieve....
So just add an Cs stage after the cascode output.... and Make the CS Stage's outpet as accurate DC level.... This will help i think,,
And,, By using CS configuration... at the output... you can get good output swings......
Thanks.. hope this will work for you...
I still see your pos & neg terminal are the same even after adding the 2nd stage. Was the connection corrected in simulation?
Hi Viper,
One query : The bulk of NMOS (M14,M13) is connected to their sources. Is it Okay?
Thankyou skamthey , changing pos and neg terminals really worked..
make sure you are not using your input common mode below 200mV
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