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طراحی فرستنده گیرنده برای تصویربرداری فراصوت با دقت بسیار بالا Transceiver Design for CMUT-Based Super-Resolution Ultrasound Imaging

دکتر پریسا بهنام فر

Dr. Parisa Behnamfar received the B.Sc. and M.Sc. degrees in electrical engineering, electronics, from Isfahan University of Technology, Iran, in 2004 and 2008 respectively, and Ph.D. degree in electrical and computer engineering from the University of British Columbia (UBC), Vancouver, Canada in 2014. She was with PMC-Sierra, Burnaby, BC, Canada in the Winter of 2013, working on the power and signal integrity analysis and optimization in high-speed DDR3 and DDR4 links. Since 2015, she has been with Fortinet Technologies, Burnaby, Bc, Canada, working on the design and signal integrity analysis of high-speed data communication boards. Her research interests include analog and mixed-signal integrated circuit and board design for biomedical applications, and RF integrated circuit and board design for wireless and wireline data communications.

 

طراحی فرستنده گیرنده برای تصویربرداری فراصوت با دقت بسیار بالا Transceiver Design for CMUT-Based Super-Resolution Ultrasound Imaging
مسئول برگزاری: اصغر غلامی
محل: سالن اجتماعات دانشکده برق و کامپیوتر / تاریخ: 1396-02-31 / زمان: 2:00 بعدازظهر

In ultrasound imaging, capacitive micromachined ultrasonic transducer (CMUT) technology has become a promising alternative to conventional piezoelectric-based technology. This work proposes a generic Verilog-AMS model for CMUT sensors that takes into account the non-linearities, dynamic behavior and harmonic resonances of the CMUT. Design and implementation of a comprehensive analog front-end system in a 0.35 mm high-voltage (120V) CMOS technology which includes high-voltage and fast-switching transmitters as well as low-power variable-gain receivers is presented. An on-chip adaptive biasing unit (ABU) is also included in the design which aims to improve the CMUT receive sensitivity. The ABU consists of a DC-DC converter to generate a range of bias voltage levels and a digital control unit to select the desired voltage. Co-simulation of the ABU with the Verilog-AMS model confirms the increase in the CMUT sensitivity in receive mode. In the context of CMUT super-resolution imaging, we present the design of a transceiver that supports both the fundamental and asymmetric modes of operation. The transmitter provides high-voltage pulses to the CMUT electrodes. The receiver includes transimpedance analog adders to add the fundamental mode in-phase signals as well as differential amplifiers to combine the out-of-phase signals of the asymmetric modes. Furthermore, low-power variable-gain stages are included to amplify the resulting signals and facilitate interfacing to the ultrasound imaging machine for additional processing and display. The design functionality is confirmed by experimental results.



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