AMSV Newsletter 2015

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In IET Electronics Letters <strong>2015</strong> Output pressure enhancement of CMUTs by using multiple Helmholtz resonance apertures Yuan Yu Yu, Xue Wen Cao, Sio Hang Pun, Peng Un Mak and Mang I Vai From Biomedical IC research line Motivation Architecture Multiple Helmholtz resonance apertures are proposed to enhance the output pressure of aircoupled capacitive micromachined ultrasonic transducers (CMUTs) for non-contact ultrasound imaging applications. The methodologies of defining the design parameters of CMUTs and the resonant apertures on the membrane of CMUTs are discussed. In comparing certain configurations of resonant apertures with conventional CMUTs, simulation results show that a prospective improvement of output pressure (up to 32.1%) can be achieved. Cross-section view of CMUT cell with Helmholtz resonance apertures (red dash line indicates central axis of CMUT cell (not in scale)) Implementation Verification 3D FEA model of CMUT cell and air domain: CMUT cell and air domain (Fig. a) and details of CMUT cell (Fig. b) Cross-section view of CMUT cell with Helmholtz resonance apertures (red dash line indicates central axis of CMUT cell (not in scale))
In ESSCIRC 2014 & JSSC 2016 An 11b 450 MS/s 3-way Time-Interleaved Sub-ranging Pipelined- SAR ADC in 65nm CMOS Yan Zhu, Chi-Hang Chan, Seng-Pan (Ben) U, and Rui Paulo Martins From Data Conversion and Signal Processing research line Motivation Architecture The SAR architecture demands a stringent noise requirement for the comparator design while aiming for high resolution. The mismatch spurs due to the timing, offset and gain in TI SAR limit both signal-to-noise distortion ratio (SNDR) and spurious-free dynamic range (SFDR). The pipelined-SAR ADCs still maintain their superiority in power efficiency with high resolution in deep sub-micron technology. The implementation of low stage-gain (G) relaxes the desired noise requirement in the comparator and balances the trade-off between the power dissipation and gain-bandwidth product (GBW) requirement of the Op-Amp. Time skews on the other hand are tolerated by design constraint or avoided through architecture optimizations. Proposed hybrid ADC architecture and multiple shared elements among the TI channels. Implementation Verification
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AMSV Newsletter 2015

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