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Hence these are all the important terms which refer the performance of amplifiers. The input resistance is the opposition offered by the base-emitter junction to the signal flow.īy definition, it is the ratio of small change in base-emitter voltage (ΔV BE) to the resulting change in base current (ΔI B) at constant collector-emitter voltage. Input ResistanceĪs the input circuit is forward biased, the input resistance will be low. Performance of AmplifierĪs the common emitter mode of connection is mostly adopted, let us first understand a few important terms with reference to this mode of connection. Hence it is observed that a change of 0.1v in the input gives a change of 5v in the output, which means the voltage level of the signal is amplified. This emitter current will obviously produce a change in collector current, which would also be 1mA.Ī load resistance of 5kΩ placed in the collector would produce a voltage of Let there be a change of 0.1v in the input voltage being applied, which further produces a change of 1mA in the emitter current. Curry averaged 30.1 points, 6.7 assists and 5.4 rebounds in 2015-16 while shooting 50.4 percent from the field, 45.4 percent from 3-point range and 90.8 percent. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier. The emitter current caused by the input signal contributes the collector current, which when flows through the load resistor R L, results in a large voltage drop across it. The low resistance in input circuit, lets any small change in input signal to result in an appreciable change in the output. The below figure shows how a transistor looks like when connected as an amplifier. Curry pulled down seven rebounds and dished out seven assists, tallying a plus-minus of +8 in his 39:56 of playing time. He was selected to play in 7 All-Star games. He has averaged 24.3 points, 6.5 assists and 4.6 rebounds in 826 regular-season games. This forward bias is maintained regardless of the polarity of the signal. Stephen Curry has played 13 seasons for the Warriors. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition.
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Transistor AmplifierĪ transistor acts as an amplifier by raising the strength of a weak signal. Here, let us focus how a transistor works as an amplifier. We will discuss the need for proper biasing in the next chapter.
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Emitter Follower & Darlington Amplifierįor a transistor to act as an amplifier, it should be properly biased.Transformer Coupled Class A Power Amplifier.