aryajur
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Hello,
I am trying to implement a Transimpedance Amplifier using a Common Source Stage. I tried a simple CS stage with a feedback resistor as in image CS.jpg, I get a bandwidth of around 85MHz. I figured that I can increase the Bandwidth by adding a cascode transistor above the input transistor since that would reduce the miller capacitance at the input node. But when I do that as shown in image cascode.JPG, I get a even worse bandwidth of 54MHz.
Why am I getting a lower Bandwidth?? I don't understand this. Any suggestions would help a lot !
I am trying to implement a Transimpedance Amplifier using a Common Source Stage. I tried a simple CS stage with a feedback resistor as in image CS.jpg, I get a bandwidth of around 85MHz. I figured that I can increase the Bandwidth by adding a cascode transistor above the input transistor since that would reduce the miller capacitance at the input node. But when I do that as shown in image cascode.JPG, I get a even worse bandwidth of 54MHz.
Why am I getting a lower Bandwidth?? I don't understand this. Any suggestions would help a lot !