Design of Differential Amplifier

[pnsakanjankumar]

I had designed a MOS differential amplifier using an active load(Current Mirror) but the gain achieved is very less its around 40 only. I need a gain of 10^4
can anyone tell me how to get that gain?
:sad:

 

[Raza]

Upload your design diagram.

 

[pnsakanjankumar]

see this link
http://elin.ttu.ee/mesel/Study/Subjects/0070BME/Content/CircDesg/Fig6.gif

 

[FvM]

I had designed a MOS differential amplifier using an active load(Current Mirror) but the gain achieved is very less its around 40 only. I need a gain of 10^4
can anyone tell me how to get that gain?

Did you pick some gain values from a MOS design text book before? It's not feasible with a single stage amplifier.

 

[pnsakanjankumar]

No i am just wondering whether i can design single stage amplifier of gain 10^4 or not
Thanks for your reply
Can u tell me how to design differential amplifier with this 10^4 gain

 

[FvM]

You'll need at least at telescopic cascode structure. Depending on transistor parameters, the gain will be rather 2000 - 4000 than 10^4. Besides triple cascode, there are alternative gain-boosting techniques. Refer to standard text books, e.g. Razavi.

 

[pnsakanjankumar]

Thanks for Your reply