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Questions and Answers
What is the primary characteristic of fixed bias in a BJT?
What is the primary characteristic of fixed bias in a BJT?
How does temperature affect the ICBO in bipolar junction transistors?
How does temperature affect the ICBO in bipolar junction transistors?
What happens in a fixed bias configuration if the transistor enters saturation?
What happens in a fixed bias configuration if the transistor enters saturation?
What is the back EMF generated in a self-bias circuit primarily influenced by?
What is the back EMF generated in a self-bias circuit primarily influenced by?
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In a BJT's large signal model, the collector current IC is primarily controlled by which voltage?
In a BJT's large signal model, the collector current IC is primarily controlled by which voltage?
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What is the main consequence of thermal runaway in a BJT?
What is the main consequence of thermal runaway in a BJT?
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In the context of a BJT's self-bias voltage divider, what is the Thevenin voltage VTH derived from?
In the context of a BJT's self-bias voltage divider, what is the Thevenin voltage VTH derived from?
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How does increasing the collector resistance (RC) affect the BJT's operation?
How does increasing the collector resistance (RC) affect the BJT's operation?
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What does the Early effect mathematically represent in terms of collector current?
What does the Early effect mathematically represent in terms of collector current?
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In the small signal model, what must be done to constant voltage sources?
In the small signal model, what must be done to constant voltage sources?
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Which of the following is true about FETs compared to BJTs?
Which of the following is true about FETs compared to BJTs?
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What does a change in voltage V1 affect in a MOSFET?
What does a change in voltage V1 affect in a MOSFET?
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Which equation correctly defines output resistance considering the Early effect?
Which equation correctly defines output resistance considering the Early effect?
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In the relationship ΔICαΔVC, what condition is significant?
In the relationship ΔICαΔVC, what condition is significant?
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What is the primary charge carrier in a Junction Field Effect Transistor (JFET)?
What is the primary charge carrier in a Junction Field Effect Transistor (JFET)?
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How is the output current in a FET controlled?
How is the output current in a FET controlled?
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How does the collector current (IC) respond to changes in base-emitter voltage (VBE) in a BJT?
How does the collector current (IC) respond to changes in base-emitter voltage (VBE) in a BJT?
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What is the primary function of biasing in a BJT circuit?
What is the primary function of biasing in a BJT circuit?
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What is transconductance (gmi) in the context of BJTs?
What is transconductance (gmi) in the context of BJTs?
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In which scenario does a BJT exhibit a stronger response to a microphone input?
In which scenario does a BJT exhibit a stronger response to a microphone input?
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What occurs during small signal operation of a transistor?
What occurs during small signal operation of a transistor?
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What is the effect of biasing on the transconductance of a BJT?
What is the effect of biasing on the transconductance of a BJT?
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How is the voltage output (Vo) related to the collector current (IC) and load resistance (RL) in the equation Vo = -RLIC?
How is the voltage output (Vo) related to the collector current (IC) and load resistance (RL) in the equation Vo = -RLIC?
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Which formula correctly represents the relationship between gm, IC, and VBE?
Which formula correctly represents the relationship between gm, IC, and VBE?
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Study Notes
BJT and FET Characteristics
-
BJT (Bipolar Junction Transistor):
- Early effect: Collector current depends on VCE due to the early effect.
- Typical VA values range from 50 to 300V.
- Punch-through effect: The reverse bias voltage of the CBJ must be within the safe limit, otherwise depletion region contact with emitter region.
- Load line analysis: Vcc - Ic * Rc = Vce; Ic * RL = Vcc - Vce.
- Ic is the quiescent collector current.
-
FET (Field-Effect Transistor):
- Types: JFET (Junction FET) and MOSFET (Metal-Oxide-Semiconductor FET).
- FETs are unipolar transistors that use voltage to control the current flow.
- FETs use the drift of majority carriers to control current, unlike the diffusion current in BJTs.
- FETs have high input impedance.
- FETs have good temperature stability.
-
General Transistor Properties
- Equal increments in base current result in equal increments in collector current.
- Common emitter configuration amplifies both current and voltage.
- Operating point (Q-point) must be considered when using transistors for amplification..
- Thermal runaway: Current increase leads to heat dissipation and further current increase causing transistor damage.
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Description
Test your knowledge on the characteristics and properties of Bipolar Junction Transistors (BJT) and Field-Effect Transistors (FET). This quiz covers key concepts including the early effect, punch-through effect, load line analysis, and types of FETs. Enhance your understanding of transistor behavior and their applications in electronic circuits.
