Table of Contents
What is the meaning of saturation region in a transistor?
Saturation is the on mode of a transistor. A transistor in saturation mode acts like a short circuit between collector and emitter. In saturation mode both of the “diodes” in the transistor are forward biased. That means VBE must be greater than 0, and so must VBC. In other words, VB must be higher than both VE and VC.
What is saturation region in output characteristics?
The region to the left of the ordinate VCB = 0, and above the IE = 0, characteristic in which both emitter and collector junction are forward biased, is called saturation region. When collector diode is forward biased, there is large change in collector current with small changes in collector voltage.
What is the condition for saturation?
What is the condition for saturation? Explanation: The condition for saturation is Vds = Vgs – Vt since at this point IR drop in the channel equals the effective gate to channel voltage at the drain. Explanation: The threshold voltage for nMOS depletion denoted as Vtd is negative.
What is saturation region and active region in transistor characteristics?
a)When both collector-base & base-emitter junction is reverse biased, it is the active region. b)When both collector-base & base-emitter junction is forward biased, it is the saturation region.
What does saturated mean in geography?
Physical Geography) meteorol the state of the atmosphere when it can hold no more water vapour at its particular temperature and pressure, the relative humidity then being 100 per cent.
Why the bulk behaves as a second gate?
As many have already pointed out, body effect acts as a second gate or back-gate to controll current and turn-on/turn-off transistor, because the threshold voltages of MOS transistors alter when body is biased with respect to source.
How does BJT work in saturation mode?
Saturation refers to a region of operation where maximum collector current flows and the BJT acts like a closed switch from collector to emitter . In this mode the BC junction forward biases and maximum current flows. The collector current cannot increase any more, even with an increase in base current.
What are the three operating region of BJT?
There are three operating regions of a bipolar junction transistor: Active region: The region in which the transistors operate as an amplifier. Saturation region: The region in which the transistor is fully on and operates as a switch such that collector current is equal to the saturation current. Cut-off region: The region in which the transistor is fully off and collector current is equal to zero.
How is MOSFET different from BJT?
The main difference 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. A BJT has three terminals namely base, emitter and collector, while a MOSFET has three terminals namely source, drain and gate.
What is early effect in BJT?
The Early effect, named after its discoverer James M. Early, is the variation in the effective width of the base in a bipolar junction transistor (BJT) due to a variation in the applied base-to-collector voltage.