Chapter 09 - CHAPTER 9 Solutions for Exercises E9.1 The...

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1 CHAPTER 9 Solutions for Exercises E9.1 The equivalent circuit for the sensor and the input resistance of the amplifier is shown in Figure 9.2 in the book. Thus the input voltage is in sensor R v + = We want the input voltage with an internal sensor resistance of 10 k to be at least 0.995 times the input voltage with an internal sensor resistance of 5 k . Thus with resistances in k , we have + + 5 995 . 0 10 Solving, we determine that is required to be greater than 990 k . E9.2 (a) A very precise instrument can be very inaccurate because precision implies that the measurements are repeatable, however they could have large bias errors. (b) A very accurate instrument cannot be very imprecise. If repeated measurements vary a great deal under apparently identical conditions, some of the measurements must have large errors and therefore are inaccurate. E9.3 V 2 . 0 5 . 5 7 . 5 2 1 = = = d V 6 . 5 ) 7 . 5 5 . 5 ( ) ( 2 1 2 1 2 1 = + = + = cm E9.4 The range of input voltages is from -5 V to +5 V or 10 V in all. We have 256 2 2 8 = = = k N zones. Thus the width of each zone is 1 . 39 10 = = mV. The quantization noise is approximately 3 . 11 3 2 rms = q mV. E9.5 Look at Figure 9.14 in the book. In this case, we have f s = 30 kHz and = 25 kHz. Thus, the alias frequency is alias = - f = 5 kHz. E9.6 The file containing the vi is named Figure 9.17.vi and can be found on the CD that accompanies this book.
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2 Answers for Selected Problems P9.2* The equivalent circuit of a sensor is shown in Figure 9.2 in the book.
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This note was uploaded on 11/02/2010 for the course ECE 3710 taught by Professor Haris during the Spring '07 term at Georgia Tech.

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Chapter 09 - CHAPTER 9 Solutions for Exercises E9.1 The...

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