59.3.1. Current and Voltage Calculations

Try these first

1. 1.

   What configuration is used to amplify voltage?

   Hint

   Think about amplifiers and their common types.

2. 2.

   What is transconductance symbolized as?

   Hint

   It relates to the change in output current.

3. 3.

   What is the voltage gain of a common source amplifier if gm is 2 mA/V and the output resistance is 3 kΩ?

   • 3
   • 6
   • 1

   Hint

   Use the formula A = gm * R.

4. 4.

   True or False: The threshold voltage indicates when a transistor starts conducting.

   • True
   • False

   Hint

   Consider the definition of threshold voltage.

5. 5.

   A common source amplifier has a threshold voltage of 1V and a gate voltage of 4V. If the output resistance is 2 kΩ and gm is 5 mA/V, calculate the voltage gain and the current flowing through the device.

   Hint

   Remember, the voltage gain relies on the relationship with gm and resistance.

6. 6.

   In a cascading arrangement, calculate the total voltage gain if the first stage common source has a gain of 10 and the following common drain stage has an approximate gain of 1. What is the overall voltage gain?

   Hint

   Cascading gains multiply!