Consider a blood pressure measurement system consisting of a pressure cuff, piezoresistive sensor, instrumentation amplifier, ADC,...

 

Transcribed Image Text:

Consider a blood pressure measurement system consisting of a pressure cuff, piezoresistive sensor, instrumentation amplifier, ADC, and a computer. The amplifier is powered by +10V and GND, so you can assume the amplifier output is limited to 1V (min) and +9V (max). The amplifier has a voltage reference VREF = 2V. The ADC operates from 0 to +10 V, and the maximum expected prissure is 240 mmHg. a. Suppose the pressure sensor has a responsivity AV/AP = 9 mV/psi. You must choose between Ad= 100, 150, 200, 250, 300, 350, 400, 450, and 500. Which one would you choose? Hint: Less than 250. b. Using your chosen value for Ad, what are the pressure values that produce Vmeas = 3V and 7V, respectively? Express your answers in mmHg. c. Assume that the output noise voltage of the instrumentation amplifier is VN = 5 mV. Compute the number of bits needed to ensure the ADC vertical resolution is smaller than half the noise voltage. d. Assuming AVMIN = VN, compute the minimum detectable pressure change in your system. Express your answer in mmHg. Hint: You should get around 0.2mmHg. Recniration Consider a blood pressure measurement system consisting of a pressure cuff, piezoresistive sensor, instrumentation amplifier, ADC, and a computer. The amplifier is powered by +10V and GND, so you can assume the amplifier output is limited to 1V (min) and +9V (max). The amplifier has a voltage reference VREF = 2V. The ADC operates from 0 to +10 V, and the maximum expected prissure is 240 mmHg. a. Suppose the pressure sensor has a responsivity AV/AP = 9 mV/psi. You must choose between Ad= 100, 150, 200, 250, 300, 350, 400, 450, and 500. Which one would you choose? Hint: Less than 250. b. Using your chosen value for Ad, what are the pressure values that produce Vmeas = 3V and 7V, respectively? Express your answers in mmHg. c. Assume that the output noise voltage of the instrumentation amplifier is VN = 5 mV. Compute the number of bits needed to ensure the ADC vertical resolution is smaller than half the noise voltage. d. Assuming AVMIN = VN, compute the minimum detectable pressure change in your system. Express your answer in mmHg. Hint: You should get around 0.2mmHg. Recniration

Answer rating: 100% (QA)

01 Ans we cant use opamp dercetly open doop Configuretuon ... View the full answer