A Four-Channel, <formula formulatype="inline"><tex Notation="TeX">${\pm} $</tex></formula>36 V, 780 kHz Piezo Driver Chip for Structural Health Monitoring

Abstract

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 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\pm} $</tex></formula> 36 V and 780 kHz. The waveform is synthesized using filtered pulse-width modulation (PWM), where the pulse transition times are precomputed through a least-square optimization problem. A calibration technique is introduced to achieve subnanosecond timing accuracy and <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$-$</tex></formula> 40.5 dB signal distortion. A 13 mm <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$^{2}$</tex></formula> proof-of-concept IC was fabricated in a 0.25 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\mu$</tex> </formula> m BCD process and evaluated within an application test bed.