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# hw_10 - Name(s(up to four students per homework set Due In...

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Due: In class, Friday April 18, 2008 Name(s) (up to four students per homework set) : Section number(s) 1. 2. 3. 4. For instructor or TA use only: Problem Score Points 1 15 2 25 3 15 4 10 5 15 6 10 7 10 M E 345 Spring Semester, 2008 Homework Set # 10 Professor J. M. Cimbala Total: 100 1 . (15 pts) An inverting amplifier is constructed using an op-amp that has a GBP of 1.20 MHz. The input impedance of the circuit is 1000 Ω , and the theoretical gain of the circuit is -100. ( a ) What resistors R 1 and R 2 are used to construct the circuit? ( b ) As discussed in class, an op-amp amplifier acts like a low-pass filter to high frequency input signals. Calculate the effective cutoff frequency of the filter. ( c ) If the input signal is a sine wave of frequency 30.0 kHz, calculate the actual (true or overall) gain of the amplifier. 2 . (25 pts) A graduate student named Dilip needs to monitor the temperature of his experiment. The range of expected temperatures is -10 to 40 o C. He decides to use a standard 100- Ω platinum RTD, along with a Wheatstone bridge circuit. He constructs the bridge with resistor R 3 as the RTD as sketched. The power supply to the bridge is 6.00 V DC. The resistance of the two lead wires is 0.685 Ω each. He wants the bridge to be balanced when T = 0 o C so that the output voltage is exactly zero when T = 0 o C. By definition, the resistance of the so-called 100- Ω RTD is 100 Ω when T = 0 o C. So, he uses 100- Ω resistors for R 1 and R 2 . However, if he also sets R 4 = 100 Ω , the bridge would not exactly balance, because of the lead wires.

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