1. OUTLINE
Main Purpose :
 Analyze two different types of Dickson Charge Pump Designs
 Offer a comparison between them
• Studying the usage and operation of Dickson Charge Pump
• Specifications for a charge pump design
• Understanding the effect of design parameters on performance
Presentation Track :
• Introduction to Dickson Charge Pump
• Specifications
• Effect of design parameters
• Analysis of two different charge pump designs
• Comparison comparison between these two designs

2. Introduction to Dickson Charge Pump
Usage and operation:
– Generating higher levels of voltage for IC
– Programming and erasing EEPROMs and Flash memories
V1 = (Vin – Vt) + V1 = 2Vin - Vt
V2 = (V1 – Vt) + V2 = 3Vin - 2Vt
:
VN = (VN-1 – Vt) + V = (N+1) Vin – NVt

3. Specifications of a Charge Pump
1. Output voltage : Vout = VN = (VN-1 – Vt) + V = (N+1)*Vin – N*Vt
> # of stages
> Vt
2. Current drivability : Iout
> Inversely proportional to Vout
Pout = Iout * Vout
> Capacitor size
> Transistor size
> Clock period
3. Power efficiency : Peff = Pout / Pin = (Iout * Vout) / (Iin * Vin)
> Clock period

4. Effects of Design Parameters
1. Output Voltage :
- # of stages
- Capacitor size
- Input voltage ( Vin )
2. Current Drivability :
- Capacitor size
- Transistor size
- Clock period
3. Power efficiency :
- Input voltage (Vin)
- Clock period
Bunlarla ilgili grafik eklemeye calıs

6. Analysis of Two Different Charge Pump Designs
1. Parallel combination of small charge pumps :
2. Large charge pump :
• For same amount of area
which one is more effective:
- Increasing # of units
- Enlarging pump size
in terms of :
- Current drivability
Iout
- Power efficiency
Peff

7. Full Charge Pump Schematic

8. Schematic of the Small Charge Pump Unit

9. 1. Results for Parallel Connection of Small Charge Pumps
• Vout vs Iout
• Vout vs Peff
• Tclk vs Iout
• Tclk vs Peff
• Vin vs Iout
• Vin vs Peff
• Vout vs Iout
• Vout vs Peff
• Tclk vs Iout
• Tclk vs Peff
• Vin vs Iout
• Vin vs Peff
2. Results for Enlarging Charge Pump Size

10. 1. Results for Parallel Connection of Small Charge Pumps
• Vout vs Iout

11. 1. Results for Parallel Connection of Small Charge Pumps
• Vout vs Peff

12. 1. Results for Parallel Connection of Small Charge Pumps
• Tclk vs Iout

13. 1. Results for Parallel Connection of Small Charge Pumps
• Tclk vs Peff

14. 1. Results for Parallel Connection of Small Charge Pumps
• Vin vs Iout

15. 1. Results for Parallel Connection of Small Charge Pumps
• Vin vs Peff

16. 2. Results for Enlarging Charge Pump Size
• Vout vs Iout

17. 2. Results for Enlarging Charge Pump Size
• Vout vs Peff

18. 2. Results for Enlarging Charge Pump Size
• Tclk vs Iout

19. 2. Results for Enlarging Charge Pump Size
• Tclk vs Peff

20. 2. Results for Enlarging Charge Pump Size
• Vin vs Iout

21. 2. Results for Enlarging Charge Pump Size
• Vin vs Peff

22. Comparison of Two Types of Charge Pumps
• Vout vs Iout

23. Comparison of Two Types of Charge Pumps
• Vout vs Peff

24. Comparison of Two Types of Charge Pumps
• Tclk vs Iout

25. Comparison of Two Types of Charge Pumps
• Tclk vs Peff

26. Comparison of Two Types of Charge Pumps
• Vin vs Iout

27. Comparison of Two Types of Charge Pumps
• Vin vs Peff

28. • > Vt = Vt0 +  [ √(s + VsB) - √(s) ]
> Parasitic capacitance
> Better to design required output
voltage ~75% of max output voltage capacity