What is the main advantage of using a FET over a BJT?
Practice Questions
Q1
What is the main advantage of using a FET over a BJT?
Higher current gain
Lower input impedance
Higher input impedance
Better thermal stability
Questions & Step-by-Step Solutions
What is the main advantage of using a FET over a BJT?
Step 1: Understand what a FET (Field Effect Transistor) is. It is a type of transistor that uses an electric field to control the flow of current.
Step 2: Understand what a BJT (Bipolar Junction Transistor) is. It is another type of transistor that uses both electron and hole charge carriers to control current.
Step 3: Learn about input impedance. Input impedance is a measure of how much a device resists incoming signals. Higher input impedance means the device can accept signals without drawing much current.
Step 4: Compare the input impedance of FETs and BJTs. FETs have a higher input impedance than BJTs.
Step 5: Recognize the advantage. Because FETs have higher input impedance, they are better for applications where you want to avoid loading down the signal source, such as in high-impedance circuits.
