Adjustable Low Dropout Voltage Regulator

angelweishan

Adjustable Low Dropout Voltage Regulator
Contents
Chapter 1 Introduction ............................................. 1
1.1 Preliminary .......................................... 2
1.2 Motivation ........................................ 6
1.3 Our Contributions.............................................. 9
1.4 Thesis Organization ................................................ 9
Chapter 2 Fundamentals of LDO Linear Regulators ......... 11
2.1 Structure and Principle of Operation....................11
2.2 Terms and Definitions ................................ 13
2.2.1 Dropout Voltage........................................ 13
2.2.2 Quiescent Current ................................. 14
2.2.3 Power Efficiency....................................... 15
2.2.4 Load Regulation .............................................. 16
2.2.5 Line Regulation ...................................... 17
2.2.6 Power Supply Rejection..................................... 18
2.2.7 Output Noise .................................................. 19
2.2.8 Stable Range of ESR ................................. 19
2.2.9 Accuracy....................................................... 20
2.2.10 Power Dissipation ..................................... 21
2.3 Design Issues of LDO ................................................... 22
2.3.1 Series Pass Devices Design Issues ........................... 23
2.3.2 Frequency Response Design Issues......................................................... 27
2.3.3 Transient Response Design Issues................................. 30
Chapter 3 Structure Analysis of Adjustable LDO Linear Regulators............ 34
3.1 Duplication type Adjustable LDO linear regulators ........... 35
3.2 Half-Duplication type LDO linear regulators............................ 37
3.3 Adjustable Feedback path type Adjustable LDO linear regulators ..... 39
3.4 Adjustable Reference Voltage Generator type LDO linear regulators...... 42
3.5 Summary....................................... 43
Chapter 4 Proposed adjustable LDO linear regulator......................... 45
4.1 Structure of Reference Voltage Generators ................. 45
4.2 Proposed Adjustable Reference Voltage Generator ........... 54
4.3 Error Amplifier........................................ 60
4.4 Proposed Dynamic Discharging Path............................. 61
Chapter 5 Simulation Results................................... 70
5.1 Layout Considerations............................................ 70
5.2 Simulation Results......................................... 72
5.3 Corner Case Simulation of Adjustable Reference Voltage Generator ..... 80
Chapter 6 Conclusions and Future Work .......................... 85
6.1 Conclusions ............................... 85
6.2 Future Work ............................................. 86
Reference........................................... 87

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