Buku Persamaan Ic Dan Transistor Amplifier Schematic Diagram

The figure below shows the basic circuit of a transistor amplifier in CE arangement. The weak input signal is applied between the emitter and base terminals and the output is taken across the load R C connected in the collector circuit. In order to achieve faithful amplification, the input circuit should always be forward biased. To do so, a d.c. Voltage V EE is applied between the base and emitter in addition to to the signal to be amplified. Voltage is called as bias voltage and its magnitude is such that it always keeps the input circuit forward biased regardless of the polarity of the signal to be amplified.

Transistor Amplifier Working During the positive half-cycle of the signal, the forward bias across the base-emitter junction is increased. Hence, more electrons flow from the emitter to the collector through the base.

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This causes an increase in emitter current as well as collector current. Now the increased collector current flows though the the high load resistance R C produces a large voltage across it. During the negative half-cycle of the signal, the forward bias across the emitter-base junction is decreased. Hence, collector current also decreases.

This results in decreased voltage drop (in opposite direction) across the load resistance. Thus, a weak signal applied in the input circuit is amplified in the collector circuit.

This way a transistor acts as an amplifier. Transistor Load line Analysis In the analysis of a transistor circuit, it is required to determine the collector current for various collector-emitter voltage. One of the methods used for this is to plot the output characteristics and determine the collector current for any desired value of collector-emitter voltage. However, there exist a more convenient method to do so, known as load line analysis method, which is quite easy and frequently used in the analysis of transistor applications. Load Line Let us consider a common emitter npn transistor circuit as shown in figure below.

In the above circuit, no signal is applied in the input circuit, hence d.c. Condition prevail in the circuit. The output characteristics of this circuit are shown in figure below.

The collector-emitter voltage at any instant is given by: As V CC and R C are fixed value,it is a first degree equation and can be represented by a straight line on the output characteristics. This is known as d.c. To draw the load line, we need to know two end points of the straight line.

These two points can be determined as follows: (i) Let the collector current I C = 0, then the collector-emitter voltage attains the maximum value and is equal to V CC. This gives the first point B, where OB =V CC, on the x-axis (collector-emitter voltage axis) as shown in figure below. (ii) Now let the collector-emitter voltage V CE = 0, the collector current is maximum and is equal to V CC /R C i.e.

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