Questions: When designing for best bias stability the configuration should be chosen. Select one: A. collector-feedback bias B. emitter-feedback bias C. fixed-bias D. voltage-divider bias

When designing for best bias stability the configuration should be chosen.

Select one:
A. collector-feedback bias
B. emitter-feedback bias
C. fixed-bias
D. voltage-divider bias

Transcript text: When designing for best bias stability the $\qquad$ configuration should be chosen. Select one: A. collector-feedback bias B. emitter-feedback bias C. fixed-bias D. voltage-divider bias

Solution

Solution Steps

Step 1: Understanding Bias Stability

Bias stability in transistor circuits refers to the ability of the circuit to maintain a consistent operating point despite variations in temperature, transistor parameters, or power supply voltage. A stable bias ensures that the transistor operates in the desired region of its characteristic curves, typically the active region for amplifiers.

Step 2: Analyzing Bias Configurations

Let's briefly analyze each bias configuration mentioned:

Collector-feedback bias (A): This configuration provides some feedback from the collector to the base, which can help stabilize the operating point against variations in transistor beta ($\beta$).
Emitter-feedback bias (B): This configuration uses a resistor in the emitter leg, providing negative feedback that stabilizes the bias point against changes in $\beta$ and temperature.
Fixed-bias (C): This configuration is simple but offers poor stability because it does not provide any feedback to counteract variations in $\beta$ or temperature.
Voltage-divider bias (D): This configuration uses a voltage divider network to set the base voltage, providing good stability against variations in $\beta$ and temperature. It is widely used for its stability and reliability.

Step 3: Selecting the Best Configuration for Bias Stability

Among the options, the voltage-divider bias configuration is known for providing the best bias stability. It effectively stabilizes the operating point by using a voltage divider to set the base voltage, which is less sensitive to changes in transistor parameters and temperature.