From Murmann Mixed-Signal Group
BSEE, Tsinghua University, 1996
MSEE, University of Toledo, 1998
Admitted to Ph.D. Candidacy: 2007-2008
Research: Densely Integrated Interface Circuits for Aerospace Structural Health Monitoring
A promising approach in aerospace Structural Health Monitoring (SHM) is embedding a large-scale piezoelectric transducer array into the aircrafts’ structure to detect defects during service. Building the interface electronics of the large-scale array in IC form is essential to the embeddability of the whole system. The challenge is driving the piezoelectric transducer with a precise waveform at high voltages and ultrasonic frequencies. We propose a solution using pulse width modulation (PWM), in which the tone-burst signal is rendered by a series of precisely timed pulses. Circuit techniques are used to calibrate the timing of the pulses in order to achieve the precision of the waveform.
We are taping out a test chip capable of driving four piezoelectric transducers at 36V and up to 850 kHz. The IC is fabricated with a 0.25 micron BCD (Bipolar-CMOS-DMOS) technology.
Email: alexguo AT stanford DOT edu