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Universidad Politecnica de Catalunya 1 May 25, 2010
Fundamentals on ADCs Jose Silva-Martinez
Jose Silva-MartinezAmesp02.tamu.edu/~jsilva
Many of these slides were provided by
Dr. Sebastian Hoyos
Amesp02.tamu.edu/~hoyos
Fundamentals of Flash ADCs
Universidad Politecnica de Catalunya 2 May 25, 2010
Fundamentals on ADCs Jose Silva-Martinez
Issues in this architecture:Accuracy, area and power consumption trade-offs due to the string of resistorsInput impedance at Vin terminalGlitches produce by the dirty comparatorsArea and power
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Fundamentals on ADCs Jose Silva-Martinez
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Fundamentals on ADCs Jose Silva-Martinez
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Fundamentals on ADCs Jose Silva-Martinez
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Fundamentals on ADCs Jose Silva-Martinez
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Fundamentals on ADCs Jose Silva-Martinez
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Fundamentals of Comparators
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Fundamentals on ADCs Jose Silva-Martinez
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Effects of CGD. The capacitors are differentiators: good friends of the fast transitions, glitches, speaks, etc.
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If you can measure it (If you can measure it (correctlycorrectly) you can correct it) you can correct it
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Be careful with the effects of kickback noiseBe careful with the effects of kickback noise
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There are always trade-offs! Check the drawbacks!There are always trade-offs! Check the drawbacks!
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Sure, but can you replace the P-Network by a simple current source?Sure, but can you replace the P-Network by a simple current source?
Is this the only Is this the only possible possible solution?solution?
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This looks much better than the previous one!This looks much better than the previous one!
Nice Nice properties:properties:
Embedded Embedded CMFBCMFB
Large gainLarge gain
Good common-Good common-mode control for mode control for next stagenext stage
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Double check performance (worst case) for all cornersDouble check performance (worst case) for all corners
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Again: double check system performanceAgain: double check system performance
Good ideas, Good ideas, but..but..
Input Input impedanceimpedance
Glitches due to Glitches due to clocksclocks
Power Power consumptionconsumption
Resolution?Resolution?
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Many other techniques have been Many other techniques have been recently reported since the recently reported since the comparators are essential part of comparators are essential part of pipelines and SD ADCspipelines and SD ADCs
We will discuss some of these We will discuss some of these topologies in the following topologies in the following lectureslectures
End of Flash ADCsEnd of Flash ADCs
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