标题: 应用于女性排卵监控系统之多轴读出电路
A Multi-axis Readout Circuit using in the Female Ovulation Monitoring Platform
作者: 余欣宜
Yu, Hsin-Yi
张锡嘉
Chang, Hsie-Chia
生医工程研究所
关键字: 女性排卵监控平台;电容式读出电路;电阻式读出电路;多轴读出电路;Female ovulation monitoring platform;Capacitive readout circuit;Resistive readout circuit;Multi-axis readout circuit
公开日期: 2015
摘要: 在本篇论文中,我们提出了一个用于帮助女性侦测排卵期的监控平台,包含监控使用者的温度及行为。根据本篇论文所提出的应用,我们实现了五组的读出电路,其中三组为电容式,用于侦测加速度计的XYZ三个方向所产生出的电容值变化,以及两组为电阻式读出电路,分别用于侦测晶片外部的人体温度,及侦测晶片自身的温度,再藉由晶片的温度去校正读出电路因温度变异而造成电路输出的影响。另外还使用两种优化电路的架构,其一是为了降低在制程上所带来电阻及电容的不匹配,对电路输出造成的偏移,我们使用降低输出偏移的补偿方法,以及为了减少因制程、电压、温度所造成变异对结果造成的影响,所以采用对输出结果取比例的方式去解决。最后我们还实现硬体共用以及事件驱动方法,去降低功耗以增加系统效能。
本论文所提出的多轴读出电路使用UMC 0.18µm CMOS-MEMS制程实作,模拟结果显示电容式读出电路解析度为0.1f;电阻式读出电路可以达到感测范围0~100°C与0.05°C之解析度。在这个多轴电路中,当只开启单轴读出电路时,运作在转换时间为0.8ms,供电电压为1.8V时功率消耗约为30µW。
In this thesis, we proposed a monitoring platform that can help women detecting their ovulation. It includes temperature and motion sensing circuits that can translate differential capacitance and resistance from sensing-ends into digital code. According to the application in this thesis, we implement five sensors in our design. Three of them are capacitance sensing circuits which induced by accelerated motion of triaxial accelerometer. The other two are resistive sensing circuits that are used to detect die-temperature and human body temperature. The die-temperature effects the results of sensor circuits that can be calibrated by sensor fusion. There are some methods for us to optimize the performance of this design. First, it decreases the offset of capacitance and resistance mismatch caused by its process or parasite. Second, it takes proportion in order to reduce effect from P-V-T variations. Finally, the hardware-sharing and event-driven architecture makes this system save more power and area.
This thesis proposed a multi-axis readout circuit which is fabricated in the process of UMC 0.18µm CMOS-MEMS technology. The simulation results show that the resolution of capacitive readout circuit is 0.1fF. Resistive readout circuit can achieve sensing range is 0~100°C with 0.05°C resolution. In this multi-axis readout circuit, when only turn on 1-axis readout circuit with 1.8V of supply voltage, it will consume about 30µW in 0.8ms conversion time.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT070256726
http://hdl.handle.net/11536/127679
显示于类别:Thesis