29.2. Voltage Gain and Small Signal Parameters

Try these first

1. 1.

   What is the main formula for calculating the voltage gain of a common emitter amplifier?

   Hint

   Remember the relationship between transconductance and collector resistance.

2. 2.

   Define input resistance for a common emitter amplifier.

   Hint

   Think about components connected to the input.

3. 3.

   What is the formula for calculating the voltage gain in a common emitter amplifier?

   • Av = -g_m / R_C
   • Av = -g_m * R_C
   • Av = g_m + R_C

   Hint

   Remember the signs and relationship of gain to resistance.

4. 4.

   True or False: The output swing of an amplifier can be increased by reducing the supply voltage.

   • True
   • False

   Hint

   Think about what happens to voltage levels.

5. 5.

   Design an amplifier circuit that meets a gain requirement of 150 while ensuring that the bandwidth stays between 20 Hz and 20 kHz. Calculate the necessary component values.

   Hint

   You'll need to balance gain and frequency components carefully.

6. 6.

   Calculate the total power dissipation if the collector current is 5 mA and the supply voltage is 12 V, considering a base current of 50 µA.

   Hint

   Break down the current contributions systematically.