63.6.2. Input Capacitance Calculation

Try these first

1. 1.

   What is the formula for calculating input capacitance?

   Hint

   Consider the different capacitance components and how they combine.

2. 2.

   Define transconductance.

   Hint

   What is it indicative of in a circuit?

3. 3.

   What does input capacitance affect in an amplifier?

   • Frequency response
   • Voltage gain
   • Both

   Hint

   Consider both aspects of performance metrics.

4. 4.

   True or False: The gain of a cascode amplifier is generally lower than that of a common emitter amplifier.

   • True
   • False

   Hint

   Reflect on the advantages of cascode designs.

5. 5.

   Design a cascode amplifier with a bias current of 5 mA. Calculate the input capacitance given specific transistor parameters.

   Hint

   Ensure you take into account the voltage gain ratios accurately.

6. 6.

   Evaluate the implications of increasing transistor β on input capacitance and system bandwidth.

   Hint

   Focus on how gain interactions and capacitance values respond to the changes in bias settings.