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Can anyone explain me how I can prove this equation below (4.19).I know that \$V_{GS1}=V_{GS2}\$ and assuming that M1,M2 is in saturation then \$ID=0.5kn(vov)^2(1+\frac{V_{DS}}{V_{A}})\$

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enter image description here

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  • \$\begingroup\$ The M2 has no way, at DC frequency, to affect the voltage on its gate. I like your derivation. \$\endgroup\$
    – analogsystemsrf
    Commented May 14, 2017 at 22:31
  • \$\begingroup\$ Thanks analogsystemsrf.Can you advice me how to prove this equation(4.19)? \$\endgroup\$
    – gr1
    Commented May 17, 2017 at 9:32

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As per the answer in the question by Mario: MOS Current Mirror

and the relation:

enter image description here

We can arrive to the equation 4.19.

Hope this helps.

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