Question

Design a emitter bias circuit to get the Q point ICQ = 2.1 mA and VCEQ = 5V

Answer 1

To design an emitter bias circuit with the desired Q point, choose a base resistor value based on the desired base current and calculate the voltage across the resistor. Finally, calculate the value of the resistor.

Step-by-step explanation:

To design an emitter bias circuit that achieves the desired Q point, ICQ = 2.1 mA and VCEQ = 5V, we can use the following steps:

1. Choose a value for the base resistor, RB, by assuming a desired base current IB. The value of IB can be calculated using the equation IB = ICQ / β, where β is the current gain of the transistor.
2. Calculate the voltage across RB using Ohm's Law: VRB = (VCC - VBE) - VCEQ. VBE is the base-emitter voltage, which is typically around 0.7V.
3. Finally, calculate the value of RB using RB = VRB / IB.

By following these steps, you can design an emitter bias circuit that will achieve the desired Q point.