無線生醫系統體內血液幫浦之驅動電路設計

Abstract

本論文在研究人體內部之血液幫浦驅動電路，其目的在於將傳送進體內的直流電壓轉換為一高壓脈波以驅動血液幫浦，使得生醫感測器得以對血液作分析。此驅動電路之架構由環式震盪器、相位不重疊時脈產生器、電荷幫浦以及電位轉移電路所組成，並使用低壓降穩壓器降低電壓源雜訊。 首先參考各式電荷幫浦電路，在比較其優劣之後選用一適當的電荷幫浦來設計高壓脈波驅動電路，另外在因應驅動電路應用之下設計一新型電荷幫浦，藉由此新型電荷幫浦發展出另一種高壓脈波驅動電路，此兩種驅動電路的特性在不同的環境應用中各有優劣，最後在考量驅動電路對低壓降穩壓器的影響下對其架構做最後修正。在充分了解其電路工作原理後，將分別經過HSPICE軟體模擬、佈局和實際晶片量測。

This thesis focuses on driver for blood pump inside human body and which converts, inside human body, DC voltage into a high-voltage pulse for driving blood pump, so bio-diagnosis sensor can analyze blood. The structure of the driver is composed of ring oscillator, nonoverlapping clock generator, charge pump and level shifter, and it uses low dropout regulator (LDO) to reduce noise from the voltage source. First, some charge pump circuits are reviewed. After comparing strengths and weaknesses of the circuits, a suitable charge pump is chosen to design high-voltage pulse driver. Second, a new charge pump is designed for converting DC into high-voltage pulse. In addition, this charge pump is designed to re-develop a new high-voltage pulse driver. These two newly designed drivers have their own strengths and weaknesses in different applications. Then, these structures are modified taking the drivers’ influence on LDO into consideration. Finally, the circuit is simulated by HSPICE, the layout is designed, and the chip is tested.