Urinary Bladder Volume Measurement System with Transimpedance Amplifier and Current-Steering DAC
Urinary Bladder Volume Measurement System with Transimpedance Amplifier and Current-Steering DAC
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DOI：
10.1109/mwscas54063.2022.9859318
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Akio Shimizu;T. Noguchi;Y. Ishikawa;S. Fukai
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文献类型：
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作者：
Akio Shimizu;T. Noguchi;Y. Ishikawa;S. Fukai
本文提出了一种非常小的相位差测量电路，在膀胱容量测量系统中使用跨阻放大器（TIA）和电流控制数模转换器（DAC）进行实时监测。由于所提出的 TIA 由输入跨导放大器 (TCA) 和反馈 TCA 组成，因此所提出的电路具有高精度和低功耗。所提出的 TIA 通过改变输入 TCA 的跨导来检测相位差。针对 TCA 的跨导变化，提出了低功耗电流引导 DAC。所提出的 DAC 由高 2 位 DAC、中 4 位 DAC 和低 4 位 DAC 组成。由于将输出电流转换为电压的电阻分别连接到DAC的输出端子，所以降低了高位DAC和中位DAC的电流消耗。提取了所提出的非常小相位差测量电路的参数，该电路在 5 V 电源电压下产生 0.0692% 的误差，同时消耗 709 µW 美元。
This paper presents a very small phase difference measurement circuit with a transimpedance amplifier (TIA) and a current-steering digital-to-analog converter (DAC) in urinary bladder volume measurement system for real time monitoring. Since the proposed TIA is composed of input transconductance amplifiers (TCAs) and feedback TCAs, the proposed circuit has high accuracy and low power consumption. The proposed TIA detects the phase difference by vary a transconductance of the input TCA. For varying transconductance of TCA, the low power current-steering DAC is proposed. The proposed DAC consists of upper 2-bit DAC, middle 4-bit DAC, and lower 4-bit DAC. Since resistances convert output current to voltage are connected to output terminals of DACs, respectively, current consumption of upper bit and middle bit DACs are reduced. Parameters of the proposed very small phase difference measurement circuit were extracted, which resulted in error of 0.0692% at 5 V supply voltage while consuming $709 \mu$W.