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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
INF5470 Fall 2012 Lecture 10: Analog Storage Content Overview - - PowerPoint PPT Presentation
INF5470 Fall 2012 Lecture 10: Analog Storage Content Overview - - PowerPoint PPT Presentation
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
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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
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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
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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
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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
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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
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AD/DA Multi-Level Storage
Ci Iin/restore Iout/restore Ib Ci Iin/restore Iout/restore Ib 4Ib 2Ib Ib C2 C1 C0 Iw Isyn restore restore C2 C1 C0
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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
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’Fusing’ Amplifier
Vdd
minus plus
- ut
bias bias minus plus
- ut
+
- Lecture 10: Analog Storage
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Weak Multi-Level Memory
level<0> +
- level<1>
+
- level<2>
+
- level<3>
+
- level<4>
+
- level<5>
+
- Lecture 10: Analog Storage
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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
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Analog ’Flash’/Floating Gate Memory
- ut
tunneling voltage hot e Vdd down up Lecture 10: Analog Storage 13
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Fowler Nordheim Tunneling Band Diagram
gate channel distance for tunneling 3.2eV e -
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High Voltage nFET
n+ n- poly n+ p-
Lecture 10: Analog Storage 15
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High Voltage Switch
Vdd bias HV Nwell drain Nwell drain switch OUT
Lecture 10: Analog Storage 16
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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
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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