47.4.3. Small Signal Parameters Consistency

Try these first

1. 1.

   What is the formula for voltage gain?

   Hint

   Remember it's about the ratio of output to input.

2. 2.

   Why is high input impedance desired?

   Hint

   Think about how one circuit affects another.

3. 3.

   What defines the voltage gain in an amplifier?

   • Output Voltage / Input Voltage
   • Input Voltage / Output Voltage
   • Collector Current / Emitter Current

   Hint

   Focus on the ratio that indicates amplification.

4. 4.

   True or False: A high output impedance is generally desirable for an amplifier.

   • True
   • False

   Hint

   Consider how amplifiers interact with other circuits.

5. 5.

   Design a common collector amplifier with a target voltage gain of nearly 1. Calculate the necessary input and output impedance if the collector current must be 1 mA.

   Hint

   Think through the dependent relationships of gain, resistances, and small signal models.

6. 6.

   Given a source resistance of 100 kΩ and an input capacitance of 10 pF, calculate how it affects the upper cutoff frequency if connected to a load of 50 Ω.

   Hint

   Don’t forget to include total resistance in your upper cutoff frequency calculations.