51.1.3. Operating Point Calculation

Try these first

1. 1.

   What is the value of the base-emitter voltage drop V_BE used in practical situations?

   Hint

   Refer to typical BJT characteristics.

2. 2.

   How do you compute the emitter voltage in a common base amplifier?

   Hint

   V_EMITTER = V_BASE - V_BE.

3. 3.

   What is the typical voltage drop across the base-emitter junction of a BJT?

   • 0.2V
   • 0.6V
   • 0.8V

   Hint

   Think about BJT characteristics.

4. 4.

   True or False: The output impedance of a common base amplifier is mainly determined by R_C.

   • True
   • False

   Hint

   Consider the overall circuit configuration.

5. 5.

   Given a common base amplifier with V_B = 10 V, V_T = 26 mV, and I_E = 2 mA, calculate g_m and r_π.

   Hint

   Remember the relationships for small signal parameters.

6. 6.

   Analyze the output impedance when the circuit shows R_C=3 kΩ and find the effect on circuit performance.

   Hint

   Calculate R_out= R_C || r_o with values derived during calculations.