How much is the base emitter voltage of the transistor?
One of the constraints on transistor action is that this voltage remains at about 0.6 volts (often referred to as the diode drop). A small change in VBE can produce a large change in collector current and achieve current amplification.
What is the maximum emitter?
4 Answers. “Emitter Base Voltage” is the maximum voltage that may be applied when the base-emitter diode is in reverse; not conducting. This is generally much lower than a small signal diode in reverse can handle. So basically it means you can’t let the base drop >5V below the emitter (or emitter 5V above the base 😉 …
Which is the most important characteristic of a BJT?
In order to distinguish these regimes we have to look at the i-v characteristics of the device. The most important characteristic of the BJT is the plot of the collector current, IC, versus the collector-emitter voltage, VCE, for various values of the base current, IBas shown on the circuit of Figure 6.
How is the base current of a bipolar junction transistor controlled?
Bipolar transistors can be considered voltage-controlled devices (fundamentally the collector current is controlled by the base-emitter voltage; the base current could be considered a defect and is controlled by the characteristics of the base-emitter junction and recombination in the base).
What happens when forward bias is applied to the base-emitter junction?
When forward bias is applied to the base–emitter junction, the equilibrium between the thermally generated carriers and the repelling electric field of the n-doped emitter depletion region is disturbed. This allows thermally excited electrons (in an NPN; holes in a PNP) to inject from the emitter into the base region.
How does electron injection occur at the collector base junction?
The collector–base junction is reverse-biased, and so negligible electron injection occurs from the collector to the base, but carriers that are injected into the base and diffuse to reach the collector-base depletion region are swept into the collector by the electric field in the depletion region.