ELE 504 Midterm: ELE504 – Fall 2005 Midterm
31 Jan 2019
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No aids other than basic calculators are permitted. The examination paper is comprised of four questions, each is worth 25 marks. If in doubt about any question, state your assumptions clearly. For each question, you must show your steps and reasoning clearly to be given part marks for your answer. Ele514-mid term exam fall 2005 1 of 8. Q1. a [10 marks] for the active i. c. temperature sensor circuit shown, (i) derive the expressions relating the output voltage, vo to the absolute temperature, t (deg. Kelvin); and (ii) the determine the expression for the temperature coefficient, tc (= dvo/dt). Collector current, ic = is exp (vbe /vt); where vt = (k/q). t. Ele514-mid term exam fall 2005 2 of 8. Q2. a [10 marks] for the op-amp circuit shown, the open-loop gain, a at 100hz is 106 . With the switch open, the measured value of v2 = 0. 010cos(2 100)t volts, when vo. Determine the value of the op-amp input resistance, ri .
