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Outline

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Outline

  1. 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. 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) + Vϕ1 = 2Vin - Vt V2 = (V1 – Vt) + Vϕ2 = 3Vin - 2Vt : VN = (VN-1 – Vt) + Vϕ = (N+1) Vin – NVt
  3. 3. Specifications of a Charge Pump 1. Output voltage : Vout = VN = (VN-1 – Vt) + Vϕ = (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. 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
  5. 5. 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
  6. 6. Full Charge Pump Schematic
  7. 7. Schematic of the Small Charge Pump Unit
  8. 8. 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
  9. 9. 1. Results for Parallel Connection of Small Charge Pumps • Vout vs Iout
  10. 10. 1. Results for Parallel Connection of Small Charge Pumps • Vout vs Peff
  11. 11. 1. Results for Parallel Connection of Small Charge Pumps • Tclk vs Iout
  12. 12. 1. Results for Parallel Connection of Small Charge Pumps • Tclk vs Peff
  13. 13. 1. Results for Parallel Connection of Small Charge Pumps • Vin vs Iout
  14. 14. 1. Results for Parallel Connection of Small Charge Pumps • Vin vs Peff
  15. 15. 2. Results for Enlarging Charge Pump Size • Vout vs Iout
  16. 16. 2. Results for Enlarging Charge Pump Size • Vout vs Peff
  17. 17. 2. Results for Enlarging Charge Pump Size • Tclk vs Iout
  18. 18. 2. Results for Enlarging Charge Pump Size • Tclk vs Peff
  19. 19. 2. Results for Enlarging Charge Pump Size • Vin vs Iout
  20. 20. 2. Results for Enlarging Charge Pump Size • Vin vs Peff
  21. 21. Comparison of Two Types of Charge Pumps • Vout vs Iout
  22. 22. Comparison of Two Types of Charge Pumps • Vout vs Peff
  23. 23. Comparison of Two Types of Charge Pumps • Tclk vs Iout
  24. 24. Comparison of Two Types of Charge Pumps • Tclk vs Peff
  25. 25. Comparison of Two Types of Charge Pumps • Vin vs Iout
  26. 26. Comparison of Two Types of Charge Pumps • Vin vs Peff
  27. 27. • > Vt = Vt0 + γ [ √(ϕs + VsB) - √(ϕs) ] > Parasitic capacitance > Better to design required output voltage ~75% of max output voltage capacity

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