58.1.4. Recapitulation of Previous Numerical Example

Try these first

1. 1.

   What is the formula to calculate the collector current (Ic) from the base current (Ib) and beta?

   Hint

   Recall the definition of beta.

2. 2.

   Define the upper cut-off frequency in simple terms.

   Hint

   Think about where the gain starts decreasing.

3. 3.

   What is the primary characteristic of a common emitter (CE) amplifier?

   • High Input Impedance
   • High Voltage Gain
   • Low Output Impedance

   Hint

   Consider the gain levels we discussed earlier.

4. 4.

   True or False: The addition of a common collector (CC) stage decreases the overall bandwidth of a multi-transistor amplifier.

   • True
   • False

   Hint

   Reflect on the reasons for using CC stages.

5. 5.

   Design a two-stage amplifier using both CE and CC configurations for a specific application that requires both high gain and broad bandwidth. What considerations will you make in terms of component selection?

   Hint

   Determine how each stage contributes to overall performance.

6. 6.

   Given a circuit with an RC coupled CE amplifier followed by a CC stage, calculate the exact overall voltage gain and bandwidth given specific parameters like transistor gains, resistor values, and capacitor values.

   Hint

   Recall the relationship of gain in multi-stage amplifiers.