Question 2.SP.15: The circuit of Fig. 2-32 adds a dc level (a bias voltage) to......

Schaum’s Outline of Electronic Devices and Circuits [1089587]

The circuit of Fig. 2-32 adds a dc level (a bias voltage) to a signal whose average value is zero. If $v_S$ is a 10-V square wave of period $T, R_L = R_1 = 10 Ω$ , and the diode is ideal, find the average value of $v_L$ .

2.32

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For $v_L > 0, D$ is forward-biased and $v_L = v_S = 10 \text{V}$ . For $v_L < 0, D$ is reverse-biased and

v_L = \frac{R_L}{R_L  +  R_1}v_s = \frac{10}{10  +  10}(-10) = -5  \text{V}

Thus, $V_{L0} = \frac{10(T/2) + (-5) (T/2)}{T} = 2.5 \text{V}$

For some symmetrical input signals, this type of circuit could destroy the symmetry of the input.

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