Team Number: ECE-17 Team Advisor: Dr. Peter A. Lewin Miniaturized, Portable Ultrasound Driver for Clinical Applications • Maryam Ahmad Electrical Engineering • Jeff Kinslow Computer Engineering • Dan Rivas Electrical Engineering • Jesse Spade Electrical Engineering
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ECE 17 Final Presentation Portable Ultrasound Driver
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Team Number: ECE-17
Team Advisor: Dr. Peter A. Lewin
Miniaturized, Portable UltrasoundDriver for Clinical Applications
• Maryam Ahmad Electrical Engineering• Jeff Kinslow Computer Engineering• Dan Rivas Electrical Engineering• Jesse Spade Electrical Engineering
Problem Description
• Current solutions for chronic wound
management have high cost, poor mobility
• Provide a viable alternative to chronic wound management
• Implemented as a low
frequency (30-100 kHz),
miniaturized, portable ultrasound applicator
• Assemble final breadboard prototype – Component Testing– Systems Integration and Integration Test
• The circuit will produce a waveform of zero-crossing tone-bursts with these attributes:
– Tone Burst Sinusoidal Frequency Range:30 kHz – 100 kHz
– Tone Burst Duration: 20 ms – 200 ms
– Pulse Repetition Frequency: 1 Hz – 30 Hz
– Output Voltage: 50 -100 Vp-p
Goals
Timer Module
DC-to-DC Converter
Battery
PowerAmplifier
Oscillator
Block Diagram
Transformer
To Ultrasonic transducer
Oscillator
Waveform Generation: Tone Burst
• Sinusoid Waveform Synthesis
• Analog Devices DDS AD9831
– Functionally identical to AD9832
– Parallel programming interface instead of serial
• ~1.1 Vp-p Sine Wave
• 0 Hz – 17.5 MHz (Master Clock Freq./ 2 )
• On-Board this CMOS chip:
– Numerically Controlled Oscillator (NCO)
– Sine Look-up Table (LUT)
– 10 bit Digital-to-Analog Converter (DAC)
Timer Module
Waveform Generation: Tone Burst
Programmed with AD software tool
via Parallel DB25 to Centronix 36 pin
Timer Module
Oscillator
Waveform Generation – Duty Cycle
• Microchip PIC12F683 Microcontroller
• Generated Duty Cycle will gate the AD9831 to produce tone-bursts
• 1.95 Hz – 17.5 MHz
• Software Library
– Enumerated list of frequency/Duty
Cycle pairs
– Functions for high-level programming
Waveform Generation – Duty Cycle
• Sample program, using our C library, to produce a 33% Duty Cycle at 30 Hz using the PIC12F683
• Compiled with freely licensed and freely available MikroElektronika microC compiler v1.6.5 (2009)