一個應用於-55˚C ~125˚C智慧型溫度感測器之1.8V、12.9微瓦三角積分類比數位轉換器

Abstract

準確且低功率消耗的溫度感測元件在量測及生物醫學領域之應用是個不可缺少的元件，隨著積體電路(IC)的技術進步，一個新的溫度感測器已經被研究並發展，此新式的溫度感測器被命名為「智慧型溫度感測器」。本篇論文提出一個適用於智慧型溫度感測器後端介面之類比-數位轉換器。並經由台積電0.18微米製程實現了一個12位元並應用在類-直流(dc-like)頻段信號的積分-三角類比數位轉換器。 本篇論文提出的電路由前端的積分-三角類比數位調變器以及後端的SINC濾波器所組成。前端的積分三角調變器以CIFF架構來達成低電壓低功率的操作，並以CDS的技巧消去低頻雜訊，而後端的SINC濾波器具備了抑制電力線雜訊的特性。此篇電路在正常模式下之功率消耗維12.917微瓦、能量消耗維0.646微焦耳，而休眠狀態之功率消耗為2.014微瓦。本篇論文之電路架構適用於低功率、高解析度之溫度感測系統應用。

Low power and accurate temperature sensing device is an essential element in many applications, such as biomedical system and instrumentation application. With the development of Integrated-Circuit(IC) technology, a new temperature sensing device has been developed. It has been named as ”Smart temperature sensor”. This thesis focuses on the design of the back-end interface of the smart temperature sensor. A sigma delta ADC with high resolution (12 bits) for dc-like signals is designed and implemented in TSMC 0.18um process. The developed circuitry is composed of a sigma-delta modulator, which utilized CIFF architecture and CDS technique for low-power, low-voltage operation and low-frequency noise reduction, and a back-end SINC filter for line-noise attenuation. A power consumption of 12.917uw and energy consumption of 0.646uJ for each conversion in normal mode and 2.014uW power consumption in sleep mode is achieved. This design is suitable to the temperature sensing system for the low-power and high-resolution conditions.