세미나
- 2022.08.30
- 483
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.