Author: misamaliraza94
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Class A Amplifier
Common emitter amplifiers are the most commonly used type of amplifier as they can have a very large voltage gain The common emitter class-A amplifier is designed to produce a large output voltage swing from a relatively small input signal voltage of only a few millivolt’s and are used mainly as “small signal amplifiers” as…
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Amplifier Distortion
Amplifier Distortion can take on many forms such as Amplitude, Frequency and Phase Distortion due to Clipping For a signal amplifier to operate correctly without any amplifier distortion of the output signal, it requires some form of DC Bias on its Base or Gate terminal. A DC bias is required so that the amplifier can…
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Common Source JFET Amplifier
Common Source JFET Amplifier uses junction field effect transistors as its main active device offering high input impedance characteristics The common source JFET amplifier has one important advantage compared to the common-emitter BJT amplifier in that the FET has an extremely high input impedance and along with a low noise output makes them ideal for…
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Common Emitter Amplifier
The most common amplifier configuration for an NPN transistor is that of the Common Emitter Amplifier circuit Transistor amplifier’s amplify an AC input signals that alternates between some positive value and a corresponding negative value. Then some way of “presetting” a common emitter amplifier circuit configuration is required so that the transistor can operate between…
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Parallel RLC Circuit Analysis
A parallel resonant circuit consists of a parallel R-L-C combination in parallel with an applied current source The Parallel RLC Circuit is the exact opposite to the series circuit we looked at in the previous tutorial although some of the previous concepts and equations still apply. However, the analysis of a parallel RLC circuits can be a little more…
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Series RLC Circuit Analysis
Series RLC circuits consist of a resistance, a capacitance and an inductance connected in series across an alternating supply Thus far we have seen that the three basic passive components of: Resistance, Inductance, and Capacitance have very different phase relationships to each other when connected to a sinusoidal alternating voltage. But we can connect these passive elements together to…
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AC Capacitance and Capacitive Reactance
The opposition to current flow through an AC Capacitor is called Capacitive Reactance and which itself is inversely proportional to the supply frequency Capacitors store energy on their conductive plates in the form of an electrical charge. The amount of charge, (Q) stored in a capacitor is linearly proportional to the voltage across the plates. Thus…
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AC Inductance & Inductive Reactance
The opposition to current flow through an AC Inductor is called Inductive Reactance and which depends lineally on the supply frequency When connected to an AC supply, the current flowing through an inductive coil produces a self-induced emf opposing the emf that initially set up the current. For a time-varying circuit which contains AC inductance,…
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AC Resistance & Impedance
The impedance of a resistor connected to a time-varying supply is simply its AC resistance as the current in it is in-phase with the voltage across it In a DC circuit the opposition to current flow is simply called resistance. In an AC circuit, resistance is called impedance. That is, impedance, measured in Ohms, is…
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Complex Numbers & Phasors
The mathematics used in Electrical Engineering to add together resistances, currents or DC voltages use what are called real numbers But real numbers are not the only kind of numbers we need to use especially when dealing with frequency dependent sinusoidal sources and vectors. As well as using normal or real numbers, Complex Numbers were introduced to…