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What is the difference between BJT and MOS?
The Bipolar Junction Transistor (BJT) is a current-driven device (in contrast, MOSFET is voltage-driven) that is widely used as an amplifier, oscillator, or switch, amongst other things. A BJT has three pins – the base, collector, and emitter – and two junctions: a p-junction and n-junction.
Does BJT consume more power than MOSFET?
MOSFET is usually more efficient switches for power supplies. BJT will consume more power because it’s wasting current when it’s switch on. Bcause you can simply set the base-emitter current to be a small fraction of the LED current to achive better efficiency.
What is the quiescent power of a transistor?
Quiescent means “at rest”. In a transistor circuit, the quiescent state is defined by the voltages and currents present in the circuit when the power supply is on and stable, and no signal is applied.
What’s the difference between BJT and MOSFET transistors?
Key Differences between BJT and MOSFET. The key differences between BJT and MOSFET transistors are discussed below. The BJT is a bipolar junction transistor whereas MOSFET is a metal oxide semiconductor field-effect transistor.
How to calculate the power dissipation in a BJT?
Since a BJT is a three-terminal device, each of which may have a different current and voltage, for the purposes of power calculation it helps to consider the transistor as two parts. Some current enters the base, and leaves the emitter, through some voltage V B E.
What makes a MOSFET a field effect transistor?
MOSFET is a kind of field effect transistor (FET) that consists of three terminals – gate, source, and drain. In a MOSFET, the drain is controlled by the voltage of the gate terminal, thus a MOSFET is a voltage-controlled device.
How are BJTs used in low current applications?
BJTs are apt for low current applications like switching purposes. The working principle of a BJT involved the use of Voltage between the two terminals such as base and emitter to regulate the flow of current through the collector terminal. For instance, the configuration of a common emitter is shown in the figure below.