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INF5470 Fall 2012 Lecture 10: Analog Storage Content Overview - PowerPoint PPT Presentation

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INF5470 Fall 2012 Lecture 10: Analog Storage Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 2

  1. INF5470 — Fall 2012 Lecture 10: Analog Storage

  2. Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 2

  3. Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 3

  4. Overview ◮ volatile short term storage ◮ capacitive storage/dynamic storage ◮ volatile long term storage ◮ digital storage and DAC ◮ capacitive storage with refresh ◮ multi level flipflops ◮ non-volatile storage ◮ floating gates, analog flash ROM Lecture 10: Analog Storage 4

  5. Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 5

  6. Capacitive Storage In contrast to digital DRAM there is no means for an ’analog refresh’. Thus, this is only useful for short term storage. in/out Lecture 10: Analog Storage 6

  7. Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 7

  8. AD/DA Multi-Level Storage Ib Iin/restore Iout/restore Ib Ci Ci Iin/restore Iout/restore restore 4Ib 2Ib Ib Isyn Iw C2 C1 C0 restore C2 C1 Lecture 10: Analog Storage 8 C0

  9. Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 9

  10. ’Fusing’ Amplifier Vdd bias plus + bias out minus - plus minus out Lecture 10: Analog Storage 10

  11. Lecture 10: Analog Storage Weak Multi-Level Memory - + level<0> - + level<1> - + level<2> - + level<3> - + level<4> - + level<5> 11

  12. Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 12

  13. Analog ’Flash’/Floating Gate Memory out up hot e tunneling down Vdd voltage Lecture 10: Analog Storage 13

  14. Fowler Nordheim Tunneling Band Diagram 3.2eV e - gate distance for tunneling channel Lecture 10: Analog Storage 14

  15. High Voltage nFET poly n+ n+ n- p- Lecture 10: Analog Storage 15

  16. High Voltage Switch Vdd HV OUT Nwell drain Nwell drain switch bias Lecture 10: Analog Storage 16

  17. Content Overview Volatile Short Term Storage Indirect Multi-Level (AD/DA Digital) Storage Direct Multi-Level Storage Non-Volatile Storage Weekly Questions Lecture 10: Analog Storage 17

  18. Weekly Questions 1. In the light of the introductory lecture about analog CMOS: why is EEPROM storage potentially difficult in more advanced standard technologies, like 90nm, 65nm ... CMOS? 2. By what mechanism do you imagine a synaptic weight could be changed in a biological synapse? One would be that the amount of neurotransmitter release in the synaptic cleft changes. Can you think of others? Lecture 10: Analog Storage 18

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