| 摘要: | 近年全球高齡化帶動整個治療及輔助醫療器材市場發展，特別是居家照護使用，如血糖儀、血壓計等，因此發展移動性、微型化與低功率消耗之照護設備是非常重要。
本論文提出用於血流速度感測之都卜勒超音波系統中探頭的驅動電路設計，為高電流、高線性度與低功率消耗之轉導放大器。提出三種電路架構討論，分別為傳統型二級放大器、互補式雙級放大器與具迴轉率補償之驅動電路。論文所提出之架構以積體電路設計並實現，透過VIS 0.5µm SOI 2P4M POLYCIDE 5V CMOS製程使用，供應電壓為5V，負載為超音波探頭等效電容2nF。互補式雙級放大器面積為850*560µm2，具迴轉率補償之驅動電路面積為812.5*532.07µm2，晶片量測分別達到5MHz正弦波訊號與10MHz正弦波訊號操作，slew-rate分別達到68V/µs與100V/µs，靜態功率消耗分別為140mW與48mW。
對於超音波探頭之大電容性負載，使用論文提出之電路架構驅動，可以使整體系統功率消耗降低。發展電池使用之微型化、穿戴式或移動性醫療產品能夠延長使用週期，使產品的穩定性大幅地提升。
;In recent years, the global aging has driven the development of the therapeutic and auxiliary medical device market, especially the use of home care, such as blood glucose meters, blood pressure monitors, etc. Therefore, it is very important to develop care equipment with mobility, miniaturization, and low power consumption.
This paper presents the design of the probe driving circuit in Doppler ultrasound system for blood flow sensing, which is an operational- transconductance-amplifier(OTA) with high current, high linearity, and low power consumption. Three circuit architectures are presented, namely conventional OTA architecture, complementary OTA architecture, and OTA with slew rate enhancer. The circuits in this paper are designed and implemented with an integrated circuit. They were fabricated in VIS 0.5μm SOI 2P4M 5V CMOS process. The supply voltage is 5V, and the load capacitor is 2nF. The area of complementary OTA architecture is 850*560µm2. The area of OTA with slew rate enhancer is 812.5*532.07μm2. The IC measurement achieves 5MHz sine wave signal and 10MHz sine wave signal, respectively. The slew-rate is 68V/μs and 100V/μs, and the static power consumption is 140mW and 48mW, respectively.
For the large capacitive load of ultrasound probes, using the architectures proposed in this paper to drive can reduce the overall system power consumption. The development of miniaturized, wearable or mobile medical products for battery-powered can extend the life cycle, and the stability can be greatly improved. |
