＃일시: 2022년 9월 2일 금요일 오후 1시 30분
＃장소: R715
＃연사: 강은철 박사
＃제목: Advanced sensor interface IC for medical ultrasound probes.
＃소속: Samsung Semiconductor, INC. (Meta Vision Lab) 미국 파세데나 소재
＃초록: This talk will present a low-noise transimpedance amplifier (TIA) designed for miniature ultrasound probes. It provides continuously-variable gain to compensate for the time-dependent attenuation of the received echo signal. This time-gain compensation (TGC) compresses the echo-signal dynamic range (DR) while avoiding imaging artifacts associated with discrete gain steps. Embedding the TGC function in the TIA reduces the output DR, saving power compared to prior solutions that apply TGC after the low-noise amplifier. The TIA employs a capacitive ladder feedback network and a current-steering circuit to obtain a linear-in-dB gain range of 37 dB. A variable-gain loop amplifier based on current-reuse stages maintains constant bandwidth in a power-efficient manner. The TIA has been integrated with a 64-channel ultrasound transceiver ASIC in a 180nm BCDMOS process and occupies a die area of 0.12mm2. It achieves a gain error below ±1dB and a 1.7pA/sqrtHz noise floor and consumes 5.2mW from a ±0.9V supply. B-mode images of a tissue-mimicking phantom are presented that show the benefits of the TGC scheme.
＃주관: 범진욱 교수 연구실