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What is the value of resultant gm if two non identical FETs are connected in parallel?

What is the value of resultant gm if two non identical FETs are connected in parallel? Correct Answer (µ1 rd2 + µ2 rd1)/ (rd1+rd2)

we know that µ=gm rd But gm’=gm1+gm2 And rd’=rd1 ×rd2/rd1+ rd2 From the above two equations, gm’=(µ1 rd2 + µ2 rd1)/ (rd1+rd2).

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