A common emitter amplifier


Posted on Mar 28, 2007

A common emitter amplifier (1) Total pole amplification circuit structure and key emitting device common emitter amplifier circuit refers to the emitter (e) of the input signal


A common emitter amplifier
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and the output signal of the common ground of basic amplifier circuits. The circuit of l-l basic structure as shown in the figure, its key components include a transistor, four resistors and two capacitors. Where the circuit bias resistor R 1 and friends through the power supply to the base of the transistor (b) power supply; a load resistor Re is given by the power transistor collector (c) power supply; two capacitors are played through AC DC blocking effect coupling capacitor; a resistor RL is the output signal carrying the load resistor. NPN type transistor amplifier with PhrP biggest difference is that the power supply: The NPN transistor amplifiers, power supply is fed to the positive supply transistor collector (c); a PNP transistor amplifier, power supply is sent to the negative supply the transistor collector electrode (c). Input signal is applied to the transistor base (b) and between the emitter (e), and the output signal is the collector of the transistor (c) and from electrode (e) between the transmitter, shows an emitter (e ) for the input signal and the output signal common terminal, thus said common emitter transistor amplifier, commonly used in the transistor voltage amplification circuit.




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