EE 330 Final Design Projects Fall 2013

Transcription

1 EE 330 Final Design Projects Fall 2013 Please the name of your group members and rank-ordered project preferences to: Please send only one request per group. In the rank-ordering, please submit your top 3 choices. At most 5 groups will be assigned per project on a first come first serve basis. Selection time will start at 5:00 p.m. on Monday November 11. Any requests with a time-stamp prior to 5:00 will be placed at the bottom of the priority list. Your may work individually or with one partner in a group of 2 people. It does not matter if your lab partner is in the same Lab section. We will try to notify you about final project selections by 8:00 p.m. on Monday November 11. Please start early on your project, and recognize that some projects may require a bit of research and on-your-own learning. READ each project carefully and thoroughly! You cannot switch projects once you have picked Project 1 Digital Alarm Clock with Battery Backup Project 2 Monophonic Keyboard Project 3 Laser Controlled Track Following Car Project 4 Touch-plate Controlled Light Dimmer with Vacation Option Project 5 Voice Controlled Light Controller Project 6 Digital Potentiometer/Amplifier/DAC Project 7 Residential Artistic Lighting Controller Project 8 Self-Defined

2 Project 1 Digital Alarm Clock with Battery Backup In this project, design an alarm clock integrated circuit in a 0.5u CMOS process which meets the following requirements. The design should be complete through post layout fabrication. 1. The time and the alarm time is programmed by the user. The time is input as typical of most digital alarm clocks with the buttons on the device. This is one time alarm clock so that you do not need to care about the date. 2. A power supply comprised of a transformer and a rectifier/ voltage regulator shown below is available. The input to the transformer is that standard 60Hz line voltage. The voltage regulator can provides a constant 5V DC output voltage. The 60Hz line frequency is to be used as the time base in the clock when power is available. 120 VRMS 60Hz 120:5 Rectifier and Regulator 5V DC 3. Assume that when power goes out that there is a battery backup to keep the clock and alarm functioning. A time-base (sometimes called an oscillator) needs to be built to serve as the clock when the line power is lost. It is not necessary that the time be real precise when the power is off. If the time base varies by +/- 20% when the power is off, that is acceptable. 4. When the time matches the alarm time, an alarm is sounded until being turned OFF or SNOOZE is press ed. SNOOZE delays the alarm for 10 minutes at which time the alarm sounds again. Inputs Alarm Program enable allows alarm to be programmed Time program enable allows time to be programmed OFF- turn off the alarm UP button for adjusting hours/min of time or alarm up one count DOWN button same as above but down

3 SELECT button Accepts value and stores if in program mode. When it in programming mode, hours are selected first, and once SELECT is pressed, the minutes can be altered. A second press of SELECT resumes operation as normal. SNOOZE button- delay the alarm for 10 minutes from it last went off. Outputs LCD display common of digital clocks including hours and minutes. Assume 24 hour military clock. using whatever LCD display you want. Specify the display by commercial part number. A display that has all 6 segments in a single package will require considerably less pins on the IC. Alarm hooked to whatever annoying device will get the person awake. But you must specify exactly what the device is along with a commercial part number and its specifications

4 Project 2 Monophonic Keyboard This project is to design an integrated circuit in a 0.5um CMOS process that preforms as a monophonic piano ( ideally only one key can be pressed at a time). The design should include layout and post-layout simulation results. The frequency of the output will be based on the frequencies of the keys of a standard 88-key piano. Should the user press more than one key at a time, the piano should be robust in that it will not cause permanent damage. You can specify what the output will be if more than one key is pressed at a time. Your piano should have the ability to play at least 3 octaves of keys (36 consecutive keys). The output should be relative to ground and should be approximately 1V p-p when a key is being played. The output impedance should be less than 10K. You will have one input clock signal available at any frequency you choose. The number of pins on the IC is limited to 24 max. The shape of the output waveform should be something that is reasonably pleasant to listen to but the shape and amplitude should be the same for each note. Unfortunately, square waves are not pleasant to listen to. One way to control the waveshape is to use a DAC to generate a sine wave or a wave similar to that coming from a violin or some other musical instrument. A DAC can be formed from a series of resistors by tapping into different nodes in the series. A DAC with 16 resistors or 32 resistors can be easily built with a serpentine resistor with tap points at the edges of the serpentine.

5 Project 3 Laser controlled track following car Design a laser-controlled tracking controller for a modified RC car. The RC car will be modified by disabling the RC control function and simply using the car for its movement and steering. The car should be designed to follow a specially constructed track. A segment of the track is shown below. The width of the black stripe is 2. The white on the sides of the stripe will be highly reflective. Gradual curves in the track will occur to eventually form a closed loop. Your goal should be to see how fast you can navigate this track. Once a verbal start command is issued, you must be able to start the car from 20 feet away with a laser pointer. Once the car starts moving it will have to navigate a nominally circular track with no directional assistance from you. You should include speed control with a laser pointer as well. Your design should keep the car on the track without any user input. You may not use a microcontroller.

6 Project 4 Touch-plate Controlled Light Dimmer with Vacation Option This project involved the design of an integrated circuit in a 0.5u CMOS process that can be used to control a Triac for dimming lights. Assume you have available a 5V dc power supply. The complete controller should involve only 3 electrical components, your IC, the 5V supply, and a commercial triac. Whereas may commercial light dimmers are controlled by a potentiometer, this will be controlled by a capacitive touch plate whereby touching in one location will cause the intensity to increase and touching in another location will cause the intensity to decrease. It should be able to control the intensity of incandescent lamps of up to 400 watts and should vary from completely off to completely on in a minimum of 8 steps. Specify a commercial TRIAC that you will use in the dimmer. As a second feature, there will be a third touch location that will put the controller in vacation mode. In vacation mode, the lights should be on at some appropriate intensity level occasionally to approximately mimic normal use of the lights. It is up to you to define how the vacation mode operates.

7 Project 5 Voice control Light Controller This project involved the design of an integrated circuit in a 0.5u CMOS process that can be used to control a Triac for turning on lights in response to a voice command. The controller should handle up to a 500 watt load. Assume you have available a 5V dc power supply. Assume you have a phototransistor that is available as a light sensor. If the light level is above a predetermined level, the lights should be able to be turned on with a SPST switch. Pressing the SPST switch a second time should turn the lights off. If the light level is below a predetermined level, they should be turned on by a voice command. Assume a microphone input is available to your system for the purpose of the voice control. Specify a commercial microphone that you will use in your design. Also specify a commercial Triac that will be used for the control of the light. When activated by voice command, they should turn off automatically after 30 seconds after the last recognized voice command.

8 Project 6 Digital Potentiometer/Amplifier/DAC This project is for the design of a digital potentiometer/amplifier/dac integrated circuit. The design should include layout and post-layout simulation results. Design a multi-purpose digitally controlled analog building block. This structure can serve as a digital potentiometer, an inverting or noninverting amplifier and a DAC depending upon the state control inputs. A method of designing the operational amplifier will be provided to you by your TA. Assume V DD =2.5V and V SS =-2.5V. The state control signals A O and A 1 will identify one of four states of operation of this device. The operation control signals C O, C 1, C 2 and C 3 are used to control the characteristics of the device in each of the four states. When A O and A 1 are high, the circuit is to perform independently as a digital potentiometer and an operational amplifier. The digital potentiometer should have 16 taps, each with a nominal impedance of 5K. When A 0 is high and A 1 is low, the circuit is to perform as a 4- bit DAC where the op amp is connected in a unity gain configuration to a tap on the potentiometer and the DAC output is determined by the control settings on the potentiometer. The DAC input, often termed V REF should be connected to one end of the resistor string and the other end should be grounded. When A 0 is low and A 1 is high, the circuit is to perform as a programmable inverting finite gain amplifier. One end of the resistor string should go to the op amp output, the wiper to the - input and the other end of the resistor string to the input. Finally, when A 0 is low and A 1 is low, the circuit is to perform as a programmable noninverting finite gain amplifier. The digital potentiometer is similar in principle to the Maxim DS 1666 but with a reduced number of taps, with parallel rather than serial control of the tap position, and with a linear taper rather than an audio taper.

9 Project 7 Residential Artistic Light Controller This project is for the design of a light controller. The design should include layout and post-layout simulation results. The controller is to control 10 lights that operate off of 110 VAC. The lights are to be uniformly spaced around a circular drive. Each light is to be controlled by a Triac. Assume the gate trigger voltage when triggered in Quadrant 2 of each triac is 1V and that the gate trigger current is at most 1mA. Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 There are to be four modes of operation described as follows All lights are OFF All lights are ON Exactly two consecutive lights are on and these two ON lights will rotate clockwise around the circle once every 10 sec Exactly four consecutive lights are on and these four lights will rotate counterclockwise around the circle once every 10 sec. The even and odd lights will alternately blink every 3 seconds at maximum brightness and an alarm will sound. A five-position rotary switch will be used to select the mode of operation. For Modes 2, 3, and 4, the intensity can be adjusted to one of 10 levels. An up-intensity switch and a downintensity switch will increase or decrease the intensity. Each successive switch position should change the power dissipation in the lamps by approximately 10%. The controller should operate the Triacs only in Quadrant 2. The buzzer that sounds in Mode 5 should be designed to provide 50mA of current with a nominal voltage of VDD across it. The voltage drop across the switch that controls the buzzer should be at most 10% of VDD when it is ON. The clock signal needed for timing can either be generated on-chip or brought in through an input pin. Include a debouncing circuit on any critical input. Anytime a switch is opened or closed, there is some chance that multiple openings and closings will be counted. A debouncing circuit eliminates the interpretation of multiple closings.

10 Project 8 Self-Defined This project will be personalized to the individual interests of the student. proposals for the self-defined projects should be approved by the course instructor. All