Analog Circuit Design Laboratory Report - MyWeb at WIT ...

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which converts pressure into a single ended voltage, a semiconductor diode based sensor system to measure an input temp and output a voltage, and a human engineered weight measurement system that accepts an input weight and outputs a single-ended voltage. The system design process incorporates first describing mathematically, from the statement of the problem, the system to be designed in the standard form 4 : y = mx + b Eq. (17) The linear performance equation of the property being measured is calculated using data measured from the device and put into the standard form of Equation 17. The signal condition circuit equation is then determined by the desired output verse the input calculated from the performance equation of the device, and put in the standard form of Equation 17. Its characteristics and wide range of functions make the op-amp one of the fundamental building blocks of circuit design. Measuring ± VSAT: Using the LM741 op-amp, whose package can be seen in Figure 1, a configuration is wired with two DC power supplies and no output load. One supply power source of +15V was connected to pin 7 and the second supply power source of -15V was connected to pin 4. The total potential across these power supplies was measured at 30V. Pin 3, also known as the non-inverting input, was wired to the positive power supply of +15V. The ±Vsat was expected to measure ± 14V; see Equation 1. The + Vsat was measured at +14.3V and – Vsat was measured at -13.63V. This measured loss compares 4 Villanucci, Robert. Wentworth Institute of Technology, Electromechanical Engineering. Laboratory Exercise Five Handouts. 14
favorably both voltages being within 10% of expected; where the positive supply had a percent difference of 2.14% and the negative supply had a percent difference of 2.64%. Input pins 2 and 3, were shorted by connecting them both to ground. From the data sheet of the op-amp, the AOL is 200, 000 typically. This was then used to calculate the Vout based on Equation 3, where Ed is equal to the voltage differential across the inputs. Here, since the inputs have been shorted, Ed is equal to 0V. However, when VOUT was measured a reading of 14.3V. This exercise was simulated in PSpice. This was devised with simulated components and adjacent voltage supplies connected by assigning the same name of the source at the inputs. Figure 8- Positive Vsat 15
Page 1 and 2: EVALUATING OPERATIONAL AMPLIFIERS I
Page 3 and 4: The ideal op-amp generally has 5 te
Page 5 and 6: ended output voltage Vo is equal th
Page 7 and 8: Negative feedback occurs when the o
Page 9 and 10: The non-inverting amplifier works s
Page 11 and 12: In association with the non-inverti
Page 13: Figure 7- Instrumentation Amplifier
Page 17 and 18: The next configuration, with a 10-k
Page 19 and 20: Figure 11- Positive Isc at approxim
Page 21 and 22: Figure 13- Plot of Ei versus time a
Page 23 and 24: Using the information derived from
Page 25 and 26: The output voltage can be altered s
Page 27 and 28: Analysis of an Inverting Amplifier
Page 29 and 30: 180º phase shift from the Vin. The
Page 31 and 32: The oscilloscope had the input volt
Page 33 and 34: Voltage (V) 8 6 4 2 0 -2 -4 -6 -8 F
Page 35 and 36: Voltage (V) 6 4 2 0 -2 -4 -6 Figure
Page 37 and 38: could be reduced to 1-kΩ. To decr
Page 39 and 40: The 10-kΩ potentiometer was then
Page 41 and 42: input stage VO’ was calculated to
Page 43 and 44: Adding Vref to an instrumentation a
Page 45 and 46: 1851g 4 lbs. 19.74 mV 2268g 5 lbs.
Page 47 and 48: Roff was calculated to be a 1.2-M
Page 49 and 50: Through the use of negative feedbac

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