52.2.3. Calculating Small Signal Parameters

Try these first

1. 1.

   Define transconductance.

   Hint

   Think about input-output relationships in a transistor.

2. 2.

   What is the typical value of V_BE for silicon BJTs?

   Hint

   Recall the diode forward bias characteristics.

3. 3.

   What is the definition of the small signal parameters?

   Hint

   Think about variations and biases.

4. 4.

   True or False: Transconductance is defined as the output voltage divided by the input current.

   • True
   • False

   Hint

   Recall the formula for transconductance.

5. 5.

   A common base amplifier has a base current of 10 µA and a beta of 100. Calculate its collector current.

   Hint

   Use the relationship between beta and base/emitter currents.

6. 6.

   If a common base amplifier is connected with a signal swing of ±3V and a DC offset of 6V, what is the maximum V_out without distortion?

   Hint

   Add the DC bias offset to the positive peak of the swing.