2014 · 38 citations · 6 references
EngineeringBiomedical EngineeringElectrical EngineeringBiomedical ImagingMicroelectronicsUltrasonographyCmos Circuit DesignLow-noise Circuit DesignMedical Imaging InstrumentationUltrasonicsUltrasound ImagingUltrasound InstrumentationAnalog Front-end CircuitsCmos Analog Circuit DesignCmos Analog Integrated CircuitsDynamic Power DissipationDynamic RangeLow-noise AmplifiersLow-power Amplifier DesignUltra-low-power Cmos
A CMUT front-end for high performance portable ultrasound medical imaging is proposed. Designed for CMUTs operating in the 1-15 MHz range, it comprises a 100-V TX driver, a high voltage T/R switch and an ultra-low-power RX amplifier. The impact of the large parasitic capacitances of high-voltage devices, responsible for SNR degradation, is minimized by careful design and dedicated circuit techniques while the RX amplifier exploits capacitive feedback to achieve a better noise-power performance than commonly adopted trans-resistance topologies. Electrical characterization as well as pulse-echo measurements are shown. The transceiver proves state-of-the-art noise performance and very high dynamic range with power dissipation of the RX amplifier of 1 mW only.
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I.O. Wygant, N. S. Jamal, H. J. Lee et al. · IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control · 2009 · 144 citations · Full text