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Chapter 05B - AI to DI Converter

Chapter 05B - AI to DI Converter -...

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ANALOG ANALOG-TO TO-DIGITAL CONVERTOR DIGITAL CONVERTOR Involve two operations, which are the sampling process and quantization process. Sampling operation is carried out by “sample-and-hold” device. Quantization process is carried o t b the a alog to digital out by the analog-to-digital convertor. Dr. Abdirahman CHAPTER 5 Page 23 of 83
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Example : V(t) is a continuous signal (analog) which is received from the sensing element is received from the sensing element. I Si l (A l ) v Input Signal (Analog) Time Dr. Abdirahman CHAPTER 5 Page 24 of 83
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V(t) can be represented by a set of sample V i where i = 1,2,3,4….. N taken at discrete interval DT (sampling i t l) interval). Dr. Abdirahman CHAPTER 5 Page 25 of 83
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Data sampling function V i 1 Time Sampling Frequency, fs = 1 Δ T Δ T Dr. Abdirahman CHAPTER 5 Page 26 of 83
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Sampled signal : V s 1 T Time Sampling frequency fs = 1 Δ T Δ T Dr. Abdirahman CHAPTER 5 Page 27 of 83 Sampling frequency, fs = 1
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Since the operation of changing from analog to digital takes couple of miliseconds, output sample has to remain constant Vsh while waiting for the next change. Sampled and hold signal.
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