common emitter sentence in Hindi
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- In the forward-active region, the Early effect modifies the collector current ( i _ \ text { C } ) and the forward common emitter current gain ( \ beta _ F ) as given by:
- The amplified signal from Q1 is directly fed to the second stage, Q3, which is a common emitter stage that provides further amplification of the signal and the DC bias for the output stages, Q4 and Q5.
- In a Common Emitter amplifier ( based on a Bipolar Junction Transistor ), if I choose to use the constant VBE biasing ( using a voltage divider at the base ), how should I establish a constant collector current?
- Transistor-based amplification can be realized using various configurations : for example a bipolar junction transistor can realize common base, common collector or common emitter amplification; a MOSFET can realize common gate, common source or common drain amplification.
- Contrary, current and voltage sources can be connected to each other without any problems, and this technique is widely used in circuitry ( e . g ., in differential amplifier stages with common emitter current source, etc .)
- The common emitter configuration driven by a constant input current or voltage and common source ( common cathode ) driven by a constant voltage naturally behave as current sources ( or sinks ) because the output impedance of these devices is naturally high.
- In the analysis of a bipolar junction transistor, for example in a common emitter configuration, the DC voltage at the collector, emitter, and base ( with respect to ground ) may be written as " "'V"
- Remember, the gain of a common emitter amplifier is ( roughly ) the ratio of the collector resistance over the total emitter resistance ( counting the internal R E of the transistor plus any external resistance / impedance that you add ); the bypass capacitor brings the total emitter resistance down to the typical few ohms or tens of ohms R E inherent in the transistor itself.
- At differential mode ( the two input voltages change in opposite directions ), the two voltage ( emitter ) followers oppose each other-while one of them tries to increase the voltage of the common emitter point, the other tries to decrease it ( figuratively speaking, one of them " pulls up " the common point while the other " pulls down " it so that it stays immovable ) and v . v . So, the common point does not change its voltage; it behaves like a virtual ground with a magnitude determined by the common-mode input voltages.
- However teh configuration is usefull because a ) the output is at higher impedance than the input and so there is voltage gain ( and therfore power gain ); b ) it is usefull in sitautions where the signal source is low impedance, and the following circuitry is relatively high impedance; and c ) the configuration puts a signal ground between the the collector-base capacitance and input, improving high frequency performance; d ) there is a notional feedback resistance ( Early effect ) between collector and base that causes negative feedbakc and thereby lowers the output resistance in the common emitter configuration.
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