應用於可植入式生醫感測微系統之高效能無線分級電源管理IC

Abstract

在本篇論文中，我們將目標放在設計並實現一個應用於高密度生醫感測平台之電源管理系統。此電源管理系統利用不同的PMU提供多組不同的輸出電壓，根據後端電路的輸出電壓及負載情況，適當的使用不同的直流轉換電路，並使其穩壓。藉由數學分析證明此電源管理系統的電路配置最佳化。主要的研究成果如下: 1.提出一個可應用於生醫感測平台之電源管理系統。前端由外部傳入AC信號，經過interposer與射頻電路耦合，整流後轉換成直流電壓。接著利用多個直流轉換器逐級降壓。可供應ADC、AFE、RF、MCU等電路穩定的輸出電壓與負載，輸出電壓範圍為0.3V~3.0V。 2.該系統為了節省電感所占電路面積，除了interposer之外，直流轉換器的部分均不使用需要電感的開關穩壓器。取而代之的是低壓差穩壓器與開關電容器。在有限的面積資源下，藉由數學分析探討上述兩者組合出的電源管理系統具有最佳的電源效率。

In this research, we design and implement a power management of high density neural sensing application. The power management system can provide different sets of output voltage through the different PMU cells. According to the different output loading of back-end circuit, we use the different DC-DC converter appropriately and regulate the output voltage. By Mathematical Analysis, we can prove the power management system, the circuit setting of which is optimized. The major contributions of this thesis are list as follows:

1. A power management system of high density neural sensing application is proposed in this thesis. An external AC signal which is transmitted to the front-end circuit coupled with RF circuit through interposer and are transferred to DC voltage. The DC voltage which is stepped down by many DC-DC converters provide the specific voltage and loading condition for ADC, AFE, RF and MCU circuit. The output voltage range is from 0.3V to 3.0V.

2. We replace switching regulator with LDO and Switched capacitor in order to save the area which occupied by the inductor(except interposer) in PCB board. With limited area overhead , we use mathematical analysis to find the power management system which is combined by LDO and Switched capacitor in some form is optimized.