27.5.1. Use of Capacitor for AC Signals

Try these first

1. 1.

   Define voltage gain.

   Hint

   Think about how much the signal is amplified.

2. 2.

   What is the role of the emitter resistor?

   Hint

   Consider what happens when transistor parameters change.

3. 3.

   What does inverting voltage gain imply?

   • True
   • False

   Hint

   Think about phase shifts and signal directions.

4. 4.

   Capacitors are used to allow DC signals to pass.

   • True
   • False

   Hint

   Recall the function of capacitors in AC circuits.

5. 5.

   Design a common emitter amplifier using given values (beta = 100, RE = 1kΩ, C = 10μF). What would be the expected low cut-off frequency?

   Hint

   Consider how capacitors interact with resistors to define frequency behavior.

6. 6.

   Given a small signal voltage of 2V and an output voltage of -5V, calculate the voltage gain, and discuss what factors could alter this gain in real applications.

   Hint

   Pay attention to both theoretical calculations and practical considerations in circuit design.