shown in fig. for $β=100.$ -

Mumbai University > EXTC > Sem 3 > Analog Electronics 1

Marks: 10 M

Year: May 2014

1. Determining $V_{th}$ and $R_{th}$

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

• From the Fig1,

  $R_{th} =R_1||R_2$

  $R_{th}=35k||20k$

  $R_{th}=12.72kΩ$

  $I=\frac{2-(-5)}{R_1+R_2 }=\frac{7}{55k}=0.127mA$

  $V_{th}-(-5V) =I R_2$

  $V_{th} = (0.127m×20k)-5V$

  $V_{th}= -2.46V$

• The reduced circuit is as shown in fig2.

Fig2 Thevenin’s equivalent circuit

2. Calculation for ICQ

• Applying KVL to base-emitter loop, …