45.1.1. Introduction

Try these first

1. 1.

   What is the purpose of a common collector amplifier?

   Hint

   Think about where it is typically used.

2. 2.

   Define input capacitance.

   Hint

   Consider what effects contribute to it.

3. 3.

   What is the approximate voltage gain of a common collector amplifier?

   • 0.5
   • 1
   • 2

   Hint

   Think about how output relates to input.

4. 4.

   True or False: Common drain amplifiers have high output impedance.

   • True
   • False

   Hint

   Recall the characteristics of common drain amplifiers.

5. 5.

   Design a common collector amplifier circuit that is required to buffer a 10kΩ source to a 1MΩ load, considering the effects of R and parasitic capacitances. Determine the values of necessary components.

   Hint

   Consider transistor datasheets for beta values.

6. 6.

   Analyze the effect of changing C_mu from 5nF to 15nF on the input capacitance of a common collector stage with an A_v of 0.7.

   Hint

   Use the input capacitance formula you've learned.