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+Vsat measures 14.06 V and –Vsat measures -12.66 V. These values differ slightly than recorded previously because of the channels being grounded. This transfer function is indicative of a non-inverting comparator. The polarity of Ei and VO are always equal. Design and Testing of a Voltage Comparator: Figure 15 is the transfer function for an inverting voltage comparator. From this plot +Vsat, -Vsat, VCC, VEE, + Ei (peak), - Ei (peak), and Vref can all be determined. +Vsat equals 12.5V. –Vsat equals -12.5V. Because Vsat is approximately 1V less than the power supply voltage, VCC is 13.5V and VEE is -13.5V. +Ei is 7.5V and -Ei is -7.5V. Because the output polarity changes at 0V, Vref is 0V. Figure 15 – Transfer Function 22
Using the information derived from Figure 5, an inverting voltage comparator is designed as shown in Figure 16. After applying dc power, Ei is adjusted to a ±7.5 V, 50Hz triangle wave. Figure 16 – Inverting voltage comparator Using the oscilloscope, channel 1 is set to measure the input voltage at pin 2. Channel 2 measures the voltage across the load resistance RL. Figure 17 displays these voltages versus time. +Vsat measures +12.50V and –Vsat measures -11.44V. 23
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 and 14: Figure 7- Instrumentation Amplifier
Page 15 and 16: favorably both voltages being withi
Page 17 and 18: The next configuration, with a 10-k
Page 19 and 20: Figure 11- Positive Isc at approxim
Page 21: Figure 13- Plot of Ei versus time a
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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