硕士班论文 Design of Energy Efficient SAR ADC

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Design of Energy Efficient Successive-Approximation Analog-to-Digital Converter


研究生 黄冠颖

本论文主要实现了两个逐渐趋近式模拟数字转换器。在第一个转换器中，我们利用调整开关的数量大小来得到新的电阻电容时间常数，藉以提升模拟数字转换器的速度。此外，此一设计使用自我时间控制的方法去控制比较器，这样可以节省一半左右的功率消耗。实验结果显示，利用 0.13 μm的制程，这个8位每秒取样两千七百万次的逐渐趋近式模拟数字转换器平均消耗功率为385 μW，每次转换所消耗的平均能量约为105 fJ。
于第二个转换器中，我们采用新的电容串架构，再加上被动式电荷重新分布的机制来提升转换器的速度，同时降低电容串部分的功率消耗，而且在转换器输入端的电容值也可以明显的减小。这个8位每秒取样五千万次的被动式电荷重新分布逐渐趋近式模拟数字转换器同样利用TSMC 0.13 μm的制程来进行设计，平均消耗功率为294 μW，每次转换所消耗平均能量约为41 fJ。


In this thesis, two successive-approximation (SAR) analog-to-digital converters (ADCs) are proposed. In the first ADC, a novel RC time constant capacitor array, which adjusts the numbers of switch, is used to speed up the conversion rate. And a self timing controller is used to control the comparator, which can save half of the power consumption of the comparator. Simulation results of the first ADC, an 8-bit 27 MS/s SAR ADC, show that the total power consumption is 385 μW and the average energy consumption per conversion step is 105 fJ in the TSMC 0.13 μm process.
In order to further increase the conversion rate, a novel capacitor array with passive charge-sharing (PCS) technique, which can effectively reduce the total power consumption and the input capacitance, is used in the second ADC. Simulation results of the second ADC, an 8-bit 50 MS/s PCS SAR ADC, show that the total power consumption is 294 μW and the average energy consumption per conversion step is 41 fJ in the TSMC 0.13 μm process.

Abstract
List of Figures
List of Tables
Chapter 1 Introduction
　1.1 Motivation
01
　1.2 Energy Efficient of Conventional ADCs
02
　1.3 Thesis Organization
03
Chapter 2 The Principle and Architectures of Successive Approximation A/D Converters
　2.1 Principle of Successive Approximation Algorithm
05
　2.2 The Architecture of Successive Approximation ADC
07
　　2.2.1 DAC-Based Successive Approximation
07
　　2.2.2 Unipolar Charge-Redistribution A/D
07
　　2.2.3 Signed Charge-Redistribution A/D with a Single Reference Voltage
11
　2.3 Capacitive Digital-to-Analog Converter
14
　　2.3.1 Binary-Weighted Capacitor Array
14
　　2.3.2 C-2C Capacitor Array
15
　　2.3.3 Pseudo C-2C Capacitor Array
16
　2.4 Latched Comparator
18
　　2.4.1 Static Latched Comparator
19
　　2.4.2 Class-AB Latched Comparator
20
　　2.4.3 Dynamic Latched Comparator
21
Chapter 3 An 8-Bit 27MS/s Successive Approximation A/D Converter
　3.1 Motivation
22
　3.2 The Architecture of Proposed Successive Approximation A/D Converter
23
　　3.2.1 Sample and Hold
25
　　3.2.2 Comparator with Rail-to-Rail Range
25
　　3.2.3 Digital-to-Analog Converter (DAC)
28
　3.3 Simulation Results
30
　　3.3.1 Functional simulation
30
　　3.3.2 Pre-layout Simulation Result
31
　　3.3.3 Post-Layout Simulation Result
35
Chapter 4 Energy Efficient Passive Charge-Sharing (PCS) Successive Approximation A/D Converter
　4.1 Motivation
40
　4.2 The Architectures of Conventional Passive Charge-Sharing SAR ADC
41
　　4.2.1 Capacitor Array
43
　　4.2.2 Comparator
44
　　4.2.3 Digital Control Circuit
45
　4.3 The Architectures of Proposed Passive Charge-Sharing SAR ADC
46
　　4.3.1 Capacitor Array
48
　　4.3.2 Comparator
49
　　4.3.3 Digital Control Circuit
51
　4.4 Simulation Results
52
　　4.4.1 Functional Simulation
52
　　4.4.2 Pre-Layout Simulation
53
Chapter 5 Conclusion and Future Works
　5.1 Conclusion
56
　5.2 Future Works
57
Reference

Reference
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