1. Introduction of charge pump
By Lin Hesheng

2. Lin Hesheng, 林和生 Tutor Min Zhang Current Project
Charge pump circuit design
Education Background (English & Chinese school name, major in)
Bachelor, Xiamen University(厦门大学), Microelectronics
Past Experience & Expertise
Power Management, PA, DAC
Area of Interest (work related)
Circuit design, modeling
Hobbies
running, travelling

3. Outline Circuit analysis & design Project of charge pump Innovations
System analysis
Auxiliary tools
Project of charge pump
Innovations
Operation principle
Schemes of charge pump
Feedback control

4. Outline Circuit analysis & design Project of charge pump Innovations
System analysis
Auxiliary tools
Project of charge pump
Innovations
Operation principle
Schemes of charge pump
Feedback control

5. System analysis(1) class Structure Circuit module Sub-circuit
Circuit level
Basic circuit
Choose system
class
Structure
Circuit module
Sub-circuit

6. System analysis(2) Algorithm model
RC-charging, area/efficiency optimization, 3-order low-pass filter(LPF)
Auxiliary tool
Matlab, C++, Verilog-AMS

7. Auxiliary tool Matlab Eg. Chip area optimization Verilog-AMS
Eg.DAC simulation

8. Outline Circuit analysis & design Project of charge pump Innovations
System analysis
Auxiliary tools
Project of charge pump
Innovations
Operation principle
Schemes of charge pump
Feedback control

9. Operation principle

10. Current drivability

11. Outline Circuit analysis & design Project of charge pump Innovations
System analysis
Auxiliary tools
Project of charge pump
Innovations
Operation principle
Schemes of charge pump
Feedback control

12. Schemes of charge pump(1)
CPA: 3V-40V charge pump, external capacitors
Objective: reduce number of capacitors
reduce chip area
improve power efficiency
CPB: 3V-15V charge pump, build-in capacitors
Objective: reduce chip area
improve current drivability

13. Schemes of charge pump(2)
Comparation：Dickson/series-parallel/Fibonacci/voltage doubler (2X)
电容外挂external cap.
电容内置build-in cap.
Fibonacci是目前提出的2-phase电荷泵中，外挂电容最少的方案
比较同等指标（输出电压/驱动能力等），build-in cap.总面积最小的是Dickson，series-parallel 和Fibonacci。由于Dickson有多个输入端，充电链路相对很短，寄生节点少，寄生电容引起电荷泄漏少，比较适合build-in方案

14. Schemes of charge pump(3)
CPA
Efficiency optimization
Decide MOS size
MOS size

15. Outline Circuit analysis & design Project of charge pump Innovations
System analysis
Auxiliary tools
Project of charge pump
Innovations
Operation principle
Schemes of charge pump
Feedback control

16. Feedback control(1) Pulse skip LDO ON/OFF Low power consumption
Larger ripple

17. Feedback control(2) Switching LDO Ron modulation ON/OFF
Logic circuit
larger power consumption
small ripple

18. Outline Circuit analysis & design Project of charge pump Innovations
System analysis
Auxiliary tools
Project of charge pump
Innovations
Operation principle
Schemes of charge pump
Feedback control

19. Innovations Efficiency improvement Chip area constraint
For CPA: small modification of structure
design of level shifter
For CPB: prevent inverse leakage current
proper operation frequency
Chip area constraint
RC-charging, slow switching limit – fast switching limit(SSL-FSL) theory
Improve current drivability
For CPB: body-bias and gate-drive of power MOS

20. Thanks for everyone!