68.1.1. Lecture – 68: Multi-Transistor Amplifiers: Amplifier with Active Load (Contd.) – Numerical Examples (Part A)

Try these first

1. 1.

   What is the main advantage of using an active load in amplifiers?

   Hint

   Think about what happens to voltage gain with resistance.

2. 2.

   Define Beta (β) in the context of transistors.

   Hint

   It reflects the amplification capacity of a transistor.

3. 3.

   What value of Beta (β) indicates a high current gain for a transistor?

   • 1
   • 100
   • 200

   Hint

   Consider typical Beta values for various types of transistors.

4. 4.

   True or False: Active loads can provide greater voltage gain than passive loads.

   • True
   • False

   Hint

   Recap on the definitions of what constitutes active vs passive.

5. 5.

   If you are designing a CE amplifier with an active load and need a collector current of 5mA with a supply voltage of 15V. Calculate the required Beta if R_B is 1.5MΩ.

   Hint

   Consider knowing V_BE(on) for your transistors.

6. 6.

   Given two BJTs in an active load configuration, if their Beta values are 150 and 300 respectively, how would you bias them to achieve equal collector currents of 10mA?

   Hint

   Use the principle of ensuring collector currents are equivalent while adjusting base widths.