Table of Contents
- 1 Why does the concept of saturation differ in BJT and MOSFETs?
- 2 What is the saturation condition of BJT and MOSFET?
- 3 What is saturation in MOSFET?
- 4 What is BJT saturation?
- 5 Why does Mosfet go into saturation?
- 6 What is the difference between active region of BJT and MOSFET?
- 7 What is the difference between a bipolar junction transistor and MOSFET?
Why does the concept of saturation differ in BJT and MOSFETs?
How does the concept of saturation differ in MOSFET with BJT? When higher gate voltage is applied, the MOSFET is driven in ohmic region. But there is no such region in BJT. (3) BJT is ON in the saturation region and MOSFET is ON in the ohmic region.
What is the saturation condition of BJT and MOSFET?
The characteristic curves of both BJT and MOSFET are similar. But a BJT is said to be in saturation when VCE ≤ 0.3V. A MOSFET is said to be in saturation when VDS > VGS – VT.
What is saturation in MOSFET?
First of all, “saturation” in mosfets means that change in VDS will not produce significant change in the Id (drain current). You can think about MOSFET in saturation as a current source. That is regardless of the voltage across VDS (with limits of course) the current through the device will be (almost) constant.
What is the difference between active and saturation regions of MOSFET?
In the saturation region, the B-E and B-C junction are forward biased. In the active region, emitter to the base junction is forward biased and the base to collector junction is reverse biased. In the active region, the transistor acts as an amplifier.
Why does saturation occur in MOSFET?
In a long channel MOSFET, the width of the pinch-off region is assumed small relative to the length of the channel. Thus, neither the length nor the voltage across the inversion layer change beyond the pinch-off, resulting in a drain current independent of drain bias. Consequently, the drain current saturates.
What is BJT saturation?
Saturation, as the name might imply, is where the base current has increased well beyond the point that the emitter-base junction is forward biased. In other words, the small base current can be made to control a much larger current between the collector and emitter.
Why does Mosfet go into saturation?
What is the difference between active region of BJT and MOSFET?
You are correct that the active region of a BJT corresponds to the saturation region of a MOSFET when these devices are used as amplifiers. The saturation region of a BJT (e.g. when turned on as a switch) corresponds to the triode/ohmic region of a MOSFET.
What is the saturation region of a BJT?
The saturation region of a BJT (e.g. when turned on as a switch) corresponds to the triode/ohmic region of a MOSFET. Some authors also call the saturation region of a MOSFET the “active mode”, which does match the terminology used for BJTs.
What happens when a MOSFET is saturated?
When the MOSFET is saturated then less heat dissipation can occur. Once it is saturated, then the potential drop across the Vce is about 200 mV. Once it is saturated, then the potential drop among the source and drain is about 20 mV. The base current of the BJT starts to supply using an +0.7V of the input voltage.
What is the difference between a bipolar junction transistor and MOSFET?
A bipolar junction transistor includes a stable saturation voltage drop like 0.7 V, whereas the MOSFET includes a 0.001-ohm on-resistance that leads to fewer power losses. A bipolar junction transistor uses a low base current for operating a larger collector current. And they perform like a current amplifier.