A Four-Channel, ${pm} $36 V, 780 kHz Piezo Driver Chip for Structural Health Monitoring

摘要

This paper describes a four-channel piezo driver chip for use in active structural health monitoring. Each channel can drive a piezoelectric transducer with a continuous-wave signal of ${pm} $36 V and 780 kHz. The waveform is synthesized using filtered pulse-width modulation (PWM), where the pulse transition times are precomputed through a least-square optimization problem. A calibration technique is introduced to achieve subnanosecond timing accuracy and $-$40.5 dB signal distortion. A 13 mm$^{2}$ proof-of-concept IC was fabricated in a 0.25 $mu$ m BCD process and evaluated within an application test bed.