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Electrical Engineering 145M - Spring 1992 - Final

# Electrical Engineering 145M - Spring 1992 - Final -...

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ee145mSp92F EE145M Spring 92 Final College of Engineering Electrical Engineering and Computer Science Berkeley Problem 1 (total 36 points): Define the following terms (30 words or less) a. (6 points) Glitch (of a D/A converter) b. (6 points) Transition Voltages (of an A/D converter) c. (6 points) Frequency Aliasing d. (6 points) Sample and Hold Amplifier e. (6 points). Flash A/D Converter f. (6 points) Successive Approximation A/D Converter Problem 2 (41 points) You have a data-acquisition system that can sample an analog waveform, digitize it and transfer the resulting digital number into computer memory every 10 micro(s) .(Note: This system has no analog filtering before digitizing). a. (5 points) What is the sampling frequency? b. (18 points) You sample a sine wave with frequency f=25kHz, look at the resulting data, and observe that there are four samples per sinewave period. How many samples per apparent sinewave period would you expect to observe if the input frequency were 10, 50, 75 and 100 kHz?

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