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In summary, a typical EmitterAmplifier, the input is connected to the B-E junction, and theoutput from the EC terminal is taken. As it provides good currentGain and good voltage gain, it is commonly used as an amplifiercircuit and is also known as an inverter amplifier as it gives 180° phase shift from input to output. First, when a bypass capacitoris attached, a common-emitter BJT amplifier with a voltage dividerbiasing configuration may cause a massive fall in voltage gain.Some of the formulae were used to calculate the voltage gain with avoltage divider biasing configuration of the common- emitter BJTamplifier.( ElProCus.2020)
There is a small difference between simulation and practicalmeasurements. Due to the tolerance values of components, simulationresults are not the same practical measurements. The maximumsymmetrical swing is the maximum peak to peak output voltage, whichis not clipped of saturated. The purpose of DC analysis is to biasthe circuit in a fixed and stable operating point known as Qpoint.The purpose of AC analysis is to analyze the small-signalparameters such as voltage gain, current gain, and inputimpedance.
By default, the effect on the voltage gain if β valueis significant, then the voltage gain is more since gain depends ongm, which itself depends on IC, gm=IC/VT.Based on the equation, IC= βIB.Suppose β is large, then IC also large. So gm is more. So thevoltage gain is more.
Similarly, if the β value is small, then the voltage gain isless. Compared to the voltage gain when B is significant. In the CEamplifier, the output voltage is 1800 out of phase withrespect to the input voltage. Therefore phase inversion takes placein the CE amplifier between input and output. By removing the CEcapacitor, it gives rise to higher input impedance, much lessdistortion in the output, a higher bias point stability, and thegain is reduced.( Electronics Hub. 2020)
