Multiple choice

Two identical NMOS transistors M1 and M2 are connected as shown below. V bias is chosen so that both transistors are in saturation. The equivalent gm of the pair is defined to be $\frac{\partial I_{out}}{\partial V_i}$at constant Vout The equivalent gm of the pair is

  1. the sum of individual gm's of the transistors

  2. the product of individual gm's of the transistors

  3. nearly equal to the gm of M1
  4. nearly equal to $\frac{g_m}{g_o}$of M2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The current in both transistor are equal. Thus $g_m$ is decide by $M_1.$

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