46.3.1. Input Resistance Calculation

Try these first

1. 1.

   What is the formula for calculating input resistance?

   Hint

   Think about how voltage and current relate in a resistor.

2. 2.

   Which law helps derive equations for current in amplifier circuits?

   Hint

   It involves how currents enter and leave a junction.

3. 3.

   What does input resistance indicate in an amplifier?

   • How much voltage is amplified
   • The load seen by the input signal
   • The total current at the output

   Hint

   Think about its role when connecting to a previous stage.

4. 4.

   True or False: Voltage gain of close to 1 indicates a non-buffering amplifier.

   • True
   • False

   Hint

   Consider what buffering means in terms of amplifier functionality.

5. 5.

   Design a common collector circuit with specified input and output resistances. Discuss how varying Rc affects performance.

   Hint

   Think about how changes to resistance affect current distribution.

6. 6.

   You have a common collector amplifier with a load resistor of 2200Ω and an input resistance of 1kΩ. Calculate the total current if the input voltage is 5V.

   Hint

   Combine resistances to find the total resistance seen by the input current.