Mumbai University > EXTC > Sem 3 > Analog Electronics 1

Marks: 10 M

Year: May 2014

1. Calculation for $R_{th}$ and $V_G$

Fig1 (a) determining $R_{th}$ (b) determining $V_G$

• $R_{th}=R_1||R_2$

  $=140k||60k$

  $=42kΩ$

• Calculation for $V_G$

  $V_G =\frac{V_{DD}×R_2}{R_1 +R_2}$

  $={20×60k}{140k+60k}$

  $=6V$

• The reduced circuit as shown in Fig2

Fig2 thevenin’s equivalent circuit

2. Calculation for $I_{DQ}$ and $V_{GSQ}$

$I_S=I_D+I_G$

Since $I_G≈0$

Hence $I_S≈ I_D$

• Applying KVL to …