Figure P9.55 shows a phototransistor that converts light intensity into an output current. The transistor must be

Question:

Figure P9.55 shows a phototransistor that converts light intensity into an output current. The transistor must be biased as shown. The transistor output versus input characteristics are shown. Design a current-to-voltage converter to produce an output voltage between 0 and $8 \mathrm{~V}$ for an input light intensity between 0 and $20 \mathrm{~mW} / \mathrm{cm}^{2}$. Power supplies of $+10 \mathrm{~V}$ and $-10 \mathrm{~V}$ are available.

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