64.4. Small Signal Equivalent Circuit Analysis

Try these first

1. 1.

   What is a cascode amplifier?

   Hint

   Think of how two transistors could work together.

2. 2.

   Define transconductance (g).

   Hint

   Consider it a sensitivity ratio.

3. 3.

   What is the primary purpose of a cascode amplifier?

   • To increase bandwidth
   • To decrease power consumption
   • To improve gain and bandwidth

   Hint

   Think about the roles of transistors in amplification.

4. 4.

   True or False: Increasing output resistance always increases bandwidth.

   • True
   • False

   Hint

   Consider the trade-offs discussed.

5. 5.

   Design a cascode amplifier that achieves a gain of 100 with specified resistances. Calculate the output voltage for an input of 10mV.

   Hint

   Consider how higher resistance would play into the calculation.

6. 6.

   Analyze the impact of reducing load capacitance on bandwidth in a cascode amplifier.

   Hint

   Review the relationship between capacitance and frequency response.