Protection circuits for ultrasound applications

A simple input protection circuit for ultrasound pulse-echo applications is described. Its performance is analyzed with regard to other widely used arrangements. Besides the primary function of showing high impedance during the transducer excitation time and a low impedance path to the amplifier in reception, issues of harmonic distortion, insertion losses, bandwidth, power dissipation, transient response, and noise are addressed. It is shown that the proposed circuit has many advantages, operating without any control signals or bias voltages. It is small and can be considered a good general-purpose protection circuit alternative.

[1]  A. Bozkurt,et al.  Design of a front-end integrated circuit for 3D acoustic imaging using 2D CMUT arrays , 2005, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[2]  S.J. Carey,et al.  A high voltage pulser ASIC for driving high frequency ultrasonic arrays , 2004, IEEE Ultrasonics Symposium, 2004.

[3]  Travis N. Blalock,et al.  A portable, low-cost, highly integrated, 3D medical ultrasound system , 2003, IEEE Symposium on Ultrasonics, 2003.

[4]  Michael Vogt,et al.  Development of a high frequency ultrasound skin imaging system: optimization utilizing time domain reflectometry and network analysis , 2003, IEEE Symposium on Ultrasonics, 2003.

[5]  Anthony N. Sinclair,et al.  Protection circuitry and time resolution in high frequency ultrasonic NDE , 1999, 1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027).

[6]  J. K. Poulsen.  Low loss wideband protection circuit for high frequency ultrasound , 1999, 1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027).

[7]  Richard K. Williams,et al.  A novel automotive 60 V load-dump protected ESD diode , 1997, Proceedings of 9th International Symposium on Power Semiconductor Devices and IC's.

[8]  M. Vester,et al.  Duplexer including a variable capacitance diode for an ultrasound imaging system , 1997 .

[9]  M. Vester,et al.  Duplexer including a field-effect transistor for use in an ultrasound imaging system , 1997 .

[10]  F. Foster,et al.  Modeling and optimization of high-frequency ultrasound transducers , 1994, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[11]  W.F. Walker,et al.  Novel transmit protection scheme for ultrasound systems , 2007, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[12]  Jin Fan,et al.  Integrated amplifier with active limiter for intravascular ultrasonic imaging , 2004, Circuits, Signals, and Systems.

[13]  J.W. Hunt,et al.  The design of protection circuitry for high-frequency ultrasound imaging systems , 1991, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.