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Explain common mode response of differential pair with necessary derivations.
written 5.3 years ago by gravatar for hetalgosavi hetalgosavi • 1.6k modified 4.0 years ago by gravatar for prashantsaini prashantsaini • 0
cmos vlsi design
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written 5.3 years ago by gravatar for hetalgosavi hetalgosavi • 1.6k

Common Mode Characteristics

(a) Circuit is symmetric but tail current source with finite resistance:

i) As $V_{in,cm}$ increases, $V_D$ increases, thereby increases drain current of $M_1\,\,and \,\,M_2$ and decreases both $V_x,\,\,V_y$.
ii) Due to symmetry, $V_x=V_y$, so they can be shorted together.

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iii) Now, $M_1\,,\,M_2$ are parallel. Therefore, circuit can …

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