40.1.5. Generalized Model of Amplifiers

Try these first

1. 1.

   What is the function of Cπ in a CE amplifier?

   Hint

   Think about how it modifies the amplifier's behavior at high frequencies.

2. 2.

   State one effect of Miller’s theorem.

   Hint

   Consider why such a simplification is useful.

3. 3.

   What is the relationship between capacitance and frequency response in amplifiers?

   • Higher capacitance allows for faster frequency response
   • Capacitance decreases frequency response
   • Capacitance has no effect on frequency response

   Hint

   Reflect on how capacitance influences signal processing.

4. 4.

   Is Miller's theorem applicable only to resistive elements?

   • True
   • False

   Hint

   Think back to the types of components Miller’s theorem can apply to!

5. 5.

   If a CE amplifier shows a gain of -1.5 with Cµ = 10pF, find the modified input capacitance using Miller’s theorem.

   Hint

   Recall the formulas for Miller's theorem!

6. 6.

   Calculate how changing Cgd from 5pF to 15pF alters the frequency response in a CS amplifier with a gain of 2.

   Hint

   Consider how capacitances generally influence frequency response!