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Chapter 5 BJT Biasing Circuits

177 | P a g e Chapter 5 BJT Biasing Circuits The DC Operation Point [5] DC Bias: Bias establishes the dc operating point for proper linear operation of an amplifier. If an amplifier is not biased with correct dc voltages on the input and output, it can go into saturation or cutoff when an input signal is applied. Figure shows the effects of proper and improper dc Biasing of an invert amplifier. Figure Examples of linear and nonlinear operation of an inverting amplifier (the triangle symbol). [5] 178 | P a g e In part (a), the output signal is an amplified replica of the input signal except that it is inverted, which means that it is 180 out of the phase with the input.

1. Determine the Q-point and construct dc load line for this transistor. Figure 5.26 For problem 1. [7] 2. Assume DC = 100 and I E I C. (a) Find V E, V C (b) Determine Q-point of this transistor (c) Construct DC load line and plot Q-point (d) Calculate IC if R B is changed from 10 k to be 1 k Figure 5.27 For problem 2.

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