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How do you find the saturation of a BJT?
Monitor the collector-emitter voltage of your circuit with a DMM. If the reading is below 0.3V, the transistor is at saturation. Transistors are having saturation voltage range from 0.7V and below but for a circuit designed for hard saturation, the VCE will be lower.
What happens in saturation region of BJT?
The BJT operates in the saturation region when its collector current is not dependent on the base current and has reached a maximum. The condition for this to happen is that both the base-emitter and the base-collector junctions should be forward-biased.
How do you calculate IC saturation?
The quick and dirty way to estimate the conditions in saturation is to assume that the transistor is ideal and that Vcesat = 0V. That means, in this case, that the current in saturation is Vs/(Re+Rc). If you want something closer (but still easy), assume that Vcesat is something on the order of 0.2 V to 0.3 V.
What is saturation current in a diode?
The saturation current is a combination of the generation current caused by thermal generation of electron hole pairs within the depletion region of the diode and the diffusion current due to minority carriers in the n and pregions diffusing across the depletion region.
How does the characteristic curve of a BJT transistor work?
The collector characteristic curve shows the behavior of the transistor. To get these curves we bias a BJT transistor with a variable power supply and changing the V BB and V CC. By variating these voltages, either transistor PN junctions may be forward or reverse biased.
When does the BJT push into the hard saturation region?
The Power BJT push into the hard-saturation region from the quasi-saturation region by increasing the base current. This region is also known as deep saturation region. The resistance offers in this region is minimum. It is even less than the quasi-saturation region. So, when the BJT operates in this region, power dissipation is minimum.
Which is a characteristic of the BJT region?
1. Cut-off region: The BE and CB both junctions are reverse bias. The base current I B =0 and collector current I C is equal to the reverse leakage current I CEO. The region below the characteristic for I B =0 is cut-off region. In this region, BJT offers large resistance to the flow of current.
Why do BJT curves have a positive slope?
In the linear (or active) region the curves would ideally be horizontal straight lines, indicating that the collector behaves as a constant current source independent of the collector voltage, as illustrated in the hybrid-π model (i. C = βi. B). Practically, these curves have a slight positive slope.