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# Homework #5 Due on May. 9, 2012 1. You have been asked to implement a digital thermometer based on a one-sided P+N junction temperature sensor. The

I'm looking for the answer of the question (d)~(h)

Homework #5 Due on May. 9, 2012 1. You have been asked to implement a digital thermometer based on a one-sided P + N junction temperature sensor. The thermometer is intended for use around room temperature or so ( T 300 K). (a) Do you expect the following J 0 -related parameters to increase or decrease with increasing temperature? (i) n i , (ii) D p , (iii) L p . Explain. (b) Based on your answers above, do you expect J 0 to increase or decrease with increasing temperature? Explain. (c) Suppose the effect of T on J 0 were ignored, will the the diode current J D at a given bias voltage increase or decrease with increasing temperature? Explain. (d) By considering effects of both (b) and (c), In general, will the the diode current J D increase or decrease with the temperature at a fixed forward bias? Explain. (e) Derive an expression for dV A / dT and identify which term is the contribution from part (b) and which term from part (c). (f) Assuming V A = 0.5 V and T = 300 K, find dV A / dT by using the equation derived in part (e). (g) Compare the result of part (f) with the numerical value extracted from the following experimental data. . (h) Which of the following bias have higher temperature sesitivity (i.e. larger V A variation) V 1 = 0.5 V or V 2 = 0.7 V? Explain.

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