![• > Vt = Vt0 + [ √(s + VsB) - √(s) ]
> Parasitic capacitance
> Better to design required output
voltage ~75% of max output voltage capacity](https://image.slidesharecdn.com/outline-130812145241-phpapp02/85/Outline-28-320.jpg)
Outline
- 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) + V1 = 2Vin - Vt V2 = (V1 – Vt) + V2 = 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