68.1.4. Example Circuit Analysis

Try these first

1. 1.

   What is the primary function of an active load in amplifiers?

   Hint

   Consider why you'd use a transistor instead of a resistor.

2. 2.

   Define collector current (I_C).

   Hint

   It's one of the key currents in a transistor's operation.

3. 3.

   What is the main advantage of using active loads over passive loads?

   • Lower cost
   • Higher voltage gain
   • Ease of implementation

   Hint

   Consider the primary purpose of using active components.

4. 4.

   True or False: Active loads can decrease the input resistance of an amplifier.

   • True
   • False

   Hint

   Consider how active devices influence circuit properties.

5. 5.

   Design a multi-transistor amplifier using active loads for a specified gain of 1500. Given transistors with β values of 120 and 80. Outline the steps you would take and the relationships you'd use to achieve this.

   Hint

   Look at the relationships between components, and how each one affects the others.

6. 6.

   Given the output voltage swing of a CE amplifier using active load is 10V-2V, analyze how this range impacts the linearity of amplification. What are the expected consequences if the load capacitance increases?

   Hint

   Understand how signal integrity is influenced by these factors.