![]() ![]() The output impedance may be as high as 10kΩ or possibly more. Again this varies considerably upon the electronic component values chosen and current levels permitted. The low input impedance results from the fact that the input is applied across the base and emitter where there is a forward-biased junction,Īlso the output impedance can be relatively high. The input impedance is typically around 1kΩ, although this can vary considerably according to the circuit values and conditions. One of the key attributes to be considered when undertaking any electronic circuit design are the impedance levels. Common emitter amplifier impedance levels The circuit is also relatively straightforward needing a few electronic components, dependent upon how the electronic circuit design requirements are fulfilled. One of e key factors is that it provides a good level of voltage gain, an attribute that is required in electronic circuit design for many applications. The table below gives a summary of the major characteristics of the common emitter transistor configuration.Ĭommon emitter transistor amplifier characteristicsįrom these characteristics, it can be seen that the common emitter configuration provides good all round performance. When selecting the transistor configuration to be used within an electronic circuit design, it is necessary to consider the various attributes of the three types: common emitter, common collector and common base, and select the one that is most appropriate. Common emitter transistor amplifier characteristics summary That said the NPN variety is more commonly used because of the more widespread us of NPN transistors. The common emitter configuration is equally applicable to both NPN transistor and PNP transistor variants. Transistor common emitter circuit configuration However, as the name of this circuit implies, the key attribute is that the emitter circuit is common to both input and output. The common emitter amplifier has the signal applied to the base and the output is then taken from the collector circuit. ![]() Of the three types of transistor configuration used in electronic circuit design, the common emitter is the most widely used because of its key attributes. Common emitter transistor amplifier basics In other words it has a 180° phase change across the circuit.ĭependent upon the actual electronic circuit design itself, the common emitter does not use too many electronic components, sometimes as few as two resistors, although if the bias needs setting for analogue circuits, then four resistors and three capacitors may be used. Therefore if a waveform that is rising enters the input of the common emitter amplifier, it will cause the output voltage to fall. It is also worth noting at this stage that the common emitter transistor amplifier inverts the signal at the input. ![]() As such the common emitter configuration is a good all round circuit for use in many applications. The common emitter circuit configuration provides voltage gain combined with a moderate current gain, as well as a medium input and a medium output impedance. The common emitter circuit configuration is used in many areas of electronic circuit design: as an audio amplifier, as a basic switch for logic circuits, as a general analogue amplifier and in many other applications. The common emitter transistor amplifier circuit is one of the mainstay circuits for use within electronic circuit design offering many advantages. Transistor circuit design Circuit configurations Common emitter Common emitter circuit design Emitter follower Common base Transistor Circuit Design Tutorial Includes: Transistor Common Emitter Amplifier The common emitter amplifier configuration provides voltage gain and is one of the most widely used transistor configurations for electronic circuit design. ![]()
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