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page 1 S. Derenzo NAME (please print) STUDENT (SID) NUMBER
UNIVERSITY OF CALIFORNIA, BERKELEY
College of Engineering Electrical Engineering and Computer Sciences
EECS 145M: Microcomputer Interfacing Lab
LAB REPORTS:
1 _________________ 2 __________________ 3 ___________________
8 _________________ 9 __________________ 10 ___________________
21 _________________ 22 __________________ 23 ___________________
24a _________________ 24b _________________ Total of top 4 Long Lab Grades Total of top 4 Short Lab Grades Lab Participation Mid-Term # Mid-Term # Final Exam Total Course Grade _______________ (400 max) _______________ (100 max) _______________ (100 max) _______________ (100 max) _______________ (100 max) _______________ (200 max) _______________ (1000 max)
COURSE LETTER
GRADE
Spring 2008 FINAL EXAM (May 16)
Answer the questions on the following pages completely, but as concisely as possible. The exam is to be taken closed book. Use the reverse side of the exam sheets if you need more space. Calculators are OK. Partial credit can only be given if you show your work. FINAL EXAM GRADE : 1 __________ (50 max) 2 __________ (24 max) 3 __________ (40 max) 4 __________ (40 max) 5 __________ (40 max) 6 __________ (6 max) TOTAL __________ (200 max)
PROBLEM 1 (total 50 points) 1.1 (10 points) List the essential handshaking steps for the reliable transfer of data from one circuit or computer to another. 1.2 (6 points) Briefly describe the operation of the sample and hold amplifier.
1.5 (10 points) Use the Fourier Frequency Convolution theorem to describe how a rectangular sampling window can produce spectral leakage in the Fourier transform of a waveform. 1.6 (10 points) Use the Fourier Frequency Convolution theorem to describe how sampling at a rate less than the twice the highest frequency in the waveform results in aliasing.
PROBLEM 2 (24 points) In this course we studied several types of A/D converters: TR Tracking SA Successive Approximation DS Dual Slope or Integrating FL Flash HF Half-flash SD Sigma-delta 2.1 (4 points) Which produce their output in a continuous manner? 2.2 (4 points) Which require a "start conversion" command? 2.3 (4 points) For N-bit conversion, which perform the conversion in N steps or less? 2.4 (4 points) For N-bit conversion, which require many more than N steps? 2.5 (4 points) Which have an accuracy that does not depend on the accuracy of internal resistors or capacitors? 2.6 (4 points) Which require a sample-and-hold amplifier for full accuracy at their maximum conversion rate?
PROBLEM 4 (total 40 points) Design a digital filter that compensates for the limited frequency response of the amplifier in the previous problem, using the following components
- the amplifier being considered
- a computer with a analog input and analog output ports 4.1 (20 points) Sketch a block diagram of your circuit. 4.2 (20 points) List the procedures that you need to determine the compensating digital filter. Include the steps where you take Fourier transforms and derive an explicit formula for the digital filter.
PROBLEM 5 (total 40 points): Design a system for automatically tuning a stringed musical instrument, such as a guitar or violin. Normally these instruments are tuned by plucking a string and turning a knob that adjusts the tension on the string until a note of the correct frequency is produced. The components you will use are:
- A microphone and amplifier to sense the acoustic waveform
- A microcomputer with analog input and output ports small enough to fit inside the instrument
- Motors connected to each tension adjustment knob
- A control circuit for each motor that responds to positive and negative analog voltages by increasing and decreasing the string tension
- A list of frequencies that each string should produce when it is in tune
- Battery power Assume the following:
- There is a switch to select “tune” and “play” modes, but don’t worry about that
- The strings are plucked manually during the tuning operation
- Each note contains its fundamental frequency and higher harmonics 5.1 (20 points) Sketch a block diagram of your circuit.
