[SOLVED] basic mos circuit question

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serhannn

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What is the voltage gain, input and output resistances of the following circuit? Ignore body effect and channel length modulation.
I found Rout =1/gm3 but I have doubts about how to find Rin and Av.. Thanks .

 

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You can go through "Analog Circuit Design" by Razavi.
 

You could confirm using small-signal analysis, but the impedance looking into the drain of cascoded MOSFETs is RL = (1+gm2*ro3)ro2+ro3. Replace the two MOSFETs with an impedance with this value. Now you should have a simple common-gate stage where Rin = (RL+ro1)/(1+gm1*ro1)
 
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