Mosfet - pengertian dasar dan cara kerja

Summary

This video explains the differences between MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) and BJTs (Bipolar Junction Transistors). MOSFETs, with their gate, drain, and source terminals, are used in high-current applications and voltage control, while BJTs, with their base, emitter, and collector terminals, are used for low-current and current control. The key difference lies in how they operate: BJTs require current at the base to function, whereas MOSFETs need voltage at the gate. The video also compares their performance using simulations, illustrating how the components behave under different conditions.

Takeaways

• 😀 MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor) are commonly used for controlling and amplifying electrical signals in various electronic applications.
• 😀 MOSFETs are used in power supplies, voltage regulators, DC-DC converters, and logic circuits within integrated circuits (ICs).
• 😀 MOSFETs have three terminals: Gate, Drain, and Source, and come in two types: N-Channel and P-Channel, typically made of silicon.
• 😀 BJTs (Bipolar Junction Transistor) also have three terminals: Base, Emitter, and Collector, and come in two types: NPN and PNP.
• 😀 The main difference between MOSFETs and BJTs lies in how they are controlled: MOSFETs are voltage-controlled, while BJTs are current-controlled.
• 😀 MOSFETs are better suited for high-current applications because they have higher input impedance and resistance compared to BJTs.
• 😀 BJTs are used in low-current circuits and require a current at the Base to operate, unlike MOSFETs, which need voltage at the Gate.
• 😀 In simulations, MOSFETs and BJTs behave differently when voltages are applied to their control terminals, with MOSFETs requiring higher Gate voltage than BJTs' Base voltage.
• 😀 The current flow in a MOSFET is from Drain to Source (for N-channel), whereas in a BJT, the current flows from Emitter to Collector.
• 😀 A key distinction is that MOSFETs need voltage to operate (no current through Gate), while BJTs require current to operate (through Base).

Q & A

What are MOSFETs used for in electronics?

MOSFETs are used to control and amplify electrical signals in various applications, such as amplifiers, switches, power regulators, DC-DC converters, and in integrated circuits (ICs) for implementing logic functions.

What is the primary difference between MOSFETs and BJTs?

The primary difference is that MOSFETs are voltage-controlled devices, whereas BJTs are current-controlled devices. MOSFETs require a voltage at the gate to operate, while BJTs require a current at the base.

What are the main components of a MOSFET and BJT?

A MOSFET consists of three terminals: Gate, Drain, and Source, and can be of N-channel or P-channel types. A BJT has three terminals: Base, Emitter, and Collector, and can be of NPN or PNP types.

Why are MOSFETs better suited for high-power applications compared to BJTs?

MOSFETs are more suitable for high-power applications because they have higher input impedance and lower resistance, which makes them more efficient in controlling voltage and handling high currents.

How does the control mechanism differ between MOSFETs and BJTs?

MOSFETs are controlled by the voltage applied at the gate, whereas BJTs are controlled by the current flowing into the base terminal.

What happens in a circuit when the gate of a MOSFET is supplied with 0.7V?

When 0.7V is applied to the gate of a MOSFET, the current that flows through it is not as large as the current in a BJT. MOSFETs generally require a higher voltage to conduct effectively.

What is the significance of the threshold voltage in a MOSFET?

The threshold voltage is the minimum voltage required at the gate for the MOSFET to start operating. For an N-channel MOSFET, the gate voltage must be greater than the threshold voltage for it to function properly.

What happens when the base of a BJT is supplied with 0.7V?

When 0.7V is applied to the base of a BJT, it allows current to flow from the collector to the emitter, enabling the transistor to conduct and operate in the circuit.

In which scenarios are BJTs preferred over MOSFETs?

BJTs are preferred in low-power applications where current control is necessary, as they are more efficient in controlling current and operate effectively with lower voltage signals.

How does current flow in an N-channel MOSFET compared to a P-channel MOSFET?

In an N-channel MOSFET, the current flows from the Drain to the Source, while in a P-channel MOSFET, the current flows from the Source to the Drain. The direction of current flow is opposite to the arrow in the MOSFET symbol.