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Chapter 12

Transistors

Bipolar Junction Transistor
Bipolar Junction Transistor
Transistors play a vital role in electronic circuits, enabling the functionality of amplifiers, memories, and microprocessors. Transistors can be designed ...
Configurations of BJT
Configurations of BJT
Bipolar junction transistors have different configurations based on the common contact. The common base configuration features a shared base terminal for ...
Working Principle of BJT
Working Principle of BJT
Consider a PNP transistor in a common-base configuration, operating in active mode. Forward biasing reduces the emitter-base potential, enabling the ...
Characteristics of BJT
Characteristics of BJT
Consider the common-emitter configuration of the BJT. The voltage and current dependencies are measured experimentally to understand the current-voltage ...
Modes of Operations of BJT
Modes of Operations of BJT
A bipolar junction transistor has four modes of operation, depending upon the voltage polarities at the emitter-base junction and the collector-base ...
Frequency Response of BJT
Frequency Response of BJT
A common-emitter amplifier's DC bias point is determined by the base-emitter voltage, base current, and collector current. The load line is determined ...
Cut-off Frequency of BJT
Cut-off Frequency of BJT
The common base configuration's current gain is constant at low frequencies of the input signal but attenuates after a specific frequency known as the ...
Switching of BJT
Switching of BJT
Consider a switching circuit that involves a sudden change in the emitter-base voltage. Initially, both the base-emitter junction and the ...
BJT Amplifiers
BJT Amplifiers
In the active region of a common emitter NPN BJT, the emitter current is the sum of the base current and the collector current. Here, the base voltage ...
Small-Signal Analysis of BJT Amplifiers
Small-Signal Analysis of BJT Amplifiers
Consider a BJT  transistor amplifier circuit operating in its active region to provide linear amplification. The total instantaneous base-emitter ...
Field Effect Transistor
Field Effect Transistor
A field effect transistor is a three-terminal unipolar device comprising a gate, drain, and source terminal. Charge carriers flow from the source to the ...
Characteristics of JFET
Characteristics of JFET
The output characteristics of a JFET describe the relationship between the drain current and the drain-source voltage at various levels of gate-source ...
Biasing of FET
Biasing of FET
A junction field effect transistor is used in electronic circuits to control electrical currents. JFETs consist of an N-type or P-type silicon bar ...
MOS Capacitor
MOS Capacitor
MOS capacitors have three layers: the bottom layer is a semiconductor substrate, the middle is an insulating layer, and the top metal layer is the gate ...
MOSFET
MOSFET
The Metal-Oxide-Semiconductor Field-Effect Transistor, or MOSFET is a semiconductor device with three terminals: the Source, the Drain, and the Gate and ...
Characteristics of MOSFET
Characteristics of MOSFET
The essential parameters of MOSFETs include the channel length, the channel width, the oxide thickness, the junction depth, and the substrate doping. With ...
MOSFET: Enhancement Mode
MOSFET: Enhancement Mode
The two modes of p- and n-channel MOSFETs are enhancement and depletion. Enhancement mode MOSFETs are typically off at zero gate-source voltage, meaning ...
MOSFET: Depletion Mode
MOSFET: Depletion Mode
Depletion-mode MOSFETs are already ON without a gate bias but need a gate-source voltage to switch OFF. They function like JFETs, where the drain-source ...
MOSFET Amplifiers
MOSFET Amplifiers
The MOSFET operates as a voltage-controlled current source in its active region, where the gate-to-source voltage regulates the drain current. This ...
Small-Signal Analysis of MOSFET Amplifiers
Small-Signal Analysis of MOSFET Amplifiers
Consider a MOSFET transistor amplifier circuit operating in its active region to provide linear amplification. The total instantaneous gate-to-source ...
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