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Chapter 12

Transistors

Transistor à jonction bipolaire
Transistor à jonction bipolaire
Transistors play a vital role in electronic circuits, enabling the functionality of amplifiers, memories, and microprocessors. Transistors can be designed ...
Configurations de BJT
Configurations de BJT
Bipolar junction transistors have different configurations based on the common contact. The common base configuration features a shared base terminal for ...
Principe de fonctionnement du BJT
Principe de fonctionnement du BJT
Consider a PNP transistor in a common-base configuration, operating in active mode. Forward biasing reduces the emitter-base potential, enabling the ...
Caractéristiques du BJT
Caractéristiques du BJT
Consider the common-emitter configuration of the BJT. The voltage and current dependencies are measured experimentally to understand the current-voltage ...
Modes de fonctionnement du BJT
Modes de fonctionnement du BJT
A bipolar junction transistor has four modes of operation, depending upon the voltage polarities at the emitter-base junction and the collector-base ...
Réponse en fréquence du BJT
Réponse en fréquence du 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 ...
Fréquence de coupure du BJT
Fréquence de coupure du 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 ...
Commutation du BJT
Commutation du BJT
Consider a switching circuit that involves a sudden change in the emitter-base voltage. Initially, both the base-emitter junction and the ...
Amplificateurs BJT
Amplificateurs BJT
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 ...
Analyse de petits signaux d’amplificateurs BJT
Analyse de petits signaux d’amplificateurs BJT
Consider a BJT  transistor amplifier circuit operating in its active region to provide linear amplification. The total instantaneous base-emitter ...
Transistor à effet de champ
Transistor à effet de champ
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 ...
Caractéristiques du JFET
Caractéristiques du 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 ...
Biais du FET
Biais du 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 ...
Condensateur MOS
Condensateur MOS
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 ...
Caractéristiques du MOSFET
Caractéristiques du 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 : Mode d’amélioration
MOSFET : Mode d’amélioration
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 : Mode d’épuisement
MOSFET : Mode d’épuisement
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 ...
Amplificateurs MOSFET
Amplificateurs MOSFET
The MOSFET operates as a voltage-controlled current source in its active region, where the gate-to-source voltage regulates the drain current. This ...
Analyse de petits signaux d’amplificateurs MOSFET
Analyse de petits signaux d’amplificateurs MOSFET
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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