What is current gain of a transistor?
What is current gain of a transistor?
Current gain is the ratio of the change in the collector current to the change in the emitter current in a transistor. Mathematically α=△Ic△Ie.
How do you find the current gain in a common base transistor?
The current gain for a CB configuration is called Alpha, ( α ). In a BJT amplifier the emitter current is always greater than the collector current as IE = IB + IC, the current gain (α) of the amplifier must therefore be less than one (unity) as IC is always less than IE by the value of IB.
What is base current in transistor?
Base current is typically 1% of emitter or collector current for small signal transistors. Most of the emitter electrons diffuse right through the thin base (c) into the base-collector depletion region.
What is the current gain of common base transistor amplifier?
The current gain of a transistor in CB configuration is defined as the ratio of output current or collector current (IC) to the input current or emitter current (IE). The current gain of a transistor in CB configuration is less than unity. The typical current gain of a common base amplifier is 0.98.
What is meant by current gain in the BJT?
In a Bipolar Junction Transistor (BJT), the current gain β is defined as the ratio of change in collector current to change in base current for constant collector voltage in collector-emiitter configuration.
How is current gain calculated?
The current gain for the common-base configuration is defined as the change in collector current divided by the change in emitter current when the base-to-collector voltage is constant.
What is formula for gain of transistor in current amplifier?
The Common Emitter Amplifier Circuit A transistors current gain is given the Greek symbol of Beta, ( β ). As the emitter current for a common emitter configuration is defined as Ie = Ic + Ib, the ratio of Ic/Ie is called Alpha, given the Greek symbol of α.
Why base current is electron current?
As electrons are injected from E to C, while passing through the base a small number recombine with holes. This results in a small net flow of current out of the base due to the inflow,of holes.
What is the relation between α and β?
β=1−α
