Common questions

Is BJT better than MOSFET?

Is BJT better than MOSFET?

BJTs are much more suitable than MOSFETs for driving low-power LEDs and similar devices from MCUs. MOSFETs are better for high-power applications because they can switch faster than BJTs, enabling them to use smaller inductors in switch-mode supplies, which increases efficiency.

Why MOSFET are better than BJT?

mosfet is much faster than bjt because in a mosfet, only majority carriers are the current. mosfet has a very high input impedance in the megohms range while bjt in the kiloohms range . thus making the mosfet very ideal for amplifier circuits. mosfets are less noisy than bjts.

Which transistor has more noisy?

The MOS transistor has the highest 1/f noise of all active semiconductors, due to their surface conduction mechanism.

What are the disadvantages of MOSFET over BJT?

Differences between BJT and MOSFET

Input current is Milliamps/ Microamps Input current is Picoamps
When the BJT is saturated then less heat dissipation can occur. When the MOSFET is saturated then less heat dissipation can occur.
The switching speed of the BJT is slower The switching speed of the MOSFET is higher

What is the biggest disadvantage of MOSFET over BJT and why?

MOSFET has lower input power loss than a BJT. The equivalent input power loss of the BJT is the sum of the input capacitance and the VBE losses. The former is just a small portion compared to the latter. The power loss due to VBE is the product of the base current and the VBE voltage.

How do I stop flickering noise?

Flicker noise can be effectively reduced by a technique called chopper stabilization or chopper, where the amplifier offset voltage is reduced.

What is the disadvantage of MOSFET?

Following are the disadvantages of MOSFET: ➨In MOSFET, the layer between Gate and Channel is very fragile which is vulnerable to electro-static damage during installation. It requires well designed circuit to avoid the issue.

What’s the difference between a MOSFET and a BJT?

Review – BJT vs MOSFET BJT and MOSFET are semiconductor devices with a wide range of applications. BJTs are bipolar devices whereas MOSFETs are unipolar devices. A BJT is a current controlled device whereas a MOSFET is a voltage control device.

What’s the difference between a MOSFET and a bipolar?

Bipolar have on state voltage drops (Vsat) dependant on load current, drive current & specific device type. A MOSFET has an on resistance Rdson rather than Vsat.

What makes a MOSFET different from other FET transistors?

The MOSFET is one kind of FET (Field Effect Transistor), which consists of three terminals namely gate, source, and drain. Here, the drain current is controlled by the voltage of the gate terminal Therefore, these transistors are voltage-controlled devices.

Why are BJT transistors good for steady state applications?

BJT transistors, on the other hand, are current-controlled, so to keep them on you have to keep sourcing (for NPN) or sinking (for PNP) current through their Base to Emitter channel. This makes MOSFETs ideally-suited to low-power applications, because you can make them draw a lot less power, especially in steady-state (ex: always ON) scenarios.

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