04_DIAG_TRANSISTOR BIASING Flashcards
(36 cards)
What is transistor biasing?
Transistor biasing is the process of setting a transistor’s operating point to ensure proper function in a circuit.
True or False: Biasing is only necessary for bipolar junction transistors (BJTs).
False.
What are the two main types of biasing for transistors?
Fixed bias and self-bias.
Fill in the blank: The purpose of biasing is to ensure that a transistor operates in the _____ region.
active
What is the role of a biasing resistor in a transistor circuit?
To set the base current and stabilize the operating point.
Multiple Choice: Which biasing method uses feedback to stabilize the operating point?
Self-bias
What is the significance of the quiescent point (Q-point) in transistor operation?
The Q-point determines the DC operating point for the transistor.
True or False: A transistor can be biased without any external components.
False.
What effect does temperature have on transistor biasing?
Temperature changes can affect the current flow and the Q-point, causing instability.
Name one method used to stabilize the Q-point against temperature variations.
Thermal compensation.
What is the purpose of a voltage divider in biasing?
To provide a stable voltage to the base of the transistor.
Multiple Choice: Which configuration is considered the most common for transistor biasing?
Voltage divider biasing
Fill in the blank: The DC load line is used to analyze the _____ of a transistor circuit.
operating point
What is meant by ‘stabilization’ in the context of transistor circuits?
The process of ensuring that the Q-point remains constant despite variations in temperature and supply voltage.
True or False: Negative feedback can improve stability in transistor biasing.
True.
How does emitter degeneration help in bias stabilization?
It reduces the gain and makes the circuit less sensitive to variations.
What is the main disadvantage of fixed biasing?
It is less stable against temperature variations.
Multiple Choice: Which component is typically used to create a voltage divider?
Resistors
What is the primary function of a bypass capacitor in a transistor circuit?
To improve AC performance while maintaining DC biasing.
Fill in the blank: In a common-emitter configuration, the input is applied to the _____ terminal.
base
What does the term ‘load line’ refer to in transistor analysis?
A graphical representation of the relationship between voltage and current in the circuit.
True or False: A transistor can be biased in both the cutoff and saturation regions.
True.
What is the main advantage of using a self-bias configuration?
It provides better thermal stability.
What does ‘thermal runaway’ refer to in transistor circuits?
A condition where increasing temperature leads to higher current, which further increases temperature.
