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Two stage MOSFET amplifier

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lana91

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This is a two stage MOSFET amplifier
I am asked to design this to have a minimum AC gain of 40 dB.
assume the values of (W/L) that keep the Mosfets in Saturation.
And Find the DC analysis.
I dont know how to start
Untitled.png
 

Dear lana91
Hi
Would you like to design one of them with yourself or , analysis of that ?
Its DC analysis is very simple. consider a current source ( mirror ) ( current reflector) .the current of right mosfets ( equal ) is about 100uA.
and i can not see complicated thing here with considering a simple current source. try , you will can analyse it with that consideration !
Best Wishes
Goldsmith
 

i have to assume values for W/L first for each mosfet right?
Then make sure they are all in saturation mode
for PMOS V_sd > V_sg -V_t
right?
so in the first pmos on the left V_d=0 since its connected to the ground?
But i dont know how to find the V_d for the other PMOS's


---------- Post added at 00:15 ---------- Previous post was at 00:13 ----------

I have to Apply DC analysis on the transistors. but like i dont understand what i have to find by doing that,
 

I am sure, you did not read the theory behind differential pair design. Better get a basic book and read the OPAMP design first. That will help you to avoid to ask very basic questions. Even if you get all the solutions but you wont understand.
 

I read about it all night and i understood it:) i appreciate u guys looking at my question.
Thankyou
 

You can find good material on how to design amplifiers in "Razavi, Fundamentals Of Microelectronics"
 

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