The document analyzes and compares two types of Dickson charge pump designs: 1) a parallel combination of small charge pumps and 2) a single large charge pump. It discusses the specifications and design parameters that affect the output voltage, current drivability, and power efficiency of each design. Graphs are presented showing the performance metrics for each design type under variations in output voltage, clock period, and input voltage. The document concludes by directly comparing the two designs across these metrics to determine which provides better current drivability and power efficiency for a given chip area.

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