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Pipeline ADC

Pipeline ADC. CSE 598A Project Proposal James Yockey. Analog to Digital Converters. Review: What does an ADC do?. http://zone.ni.com/devzone/conceptd.nsf/webmain/0A17E22A0530063386256F560071787E. Types of ADC. Flash Pipeline Others…. Flash ADC. http://www.cse.psu.edu/~chip/pdg/prop.pdf.

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Pipeline ADC

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  1. Pipeline ADC CSE 598A Project Proposal James Yockey

  2. Analog to Digital Converters Review: What does an ADC do? http://zone.ni.com/devzone/conceptd.nsf/webmain/0A17E22A0530063386256F560071787E

  3. Types of ADC • Flash • Pipeline • Others…

  4. Flash ADC http://www.cse.psu.edu/~chip/pdg/prop.pdf

  5. Pipeline ADC http://www.cse.psu.edu/~ikim/CourseWork/presentation/W8%20ADC.ppt

  6. Pipeline ADC (cont.) Using two bits for a signal that can vary from 0 to 5V, we can divide it into 4 regions. For example: 00 = 0 to 1.25 01 = 1.26 to 2.5 10 = 2.6 to 3.75 11 = 3.76 to 5.0

  7. Pipeline ADC (cont.) Assuming each stage produces one bit of output, we need two stages. Stage one will check if the MSB is 1, i.e. the input is greater than 2.5 If it is, the bit is set to one, and the subtractor subtracts 2.5 from the input. Stage two will check if the LSB is 1, the incoming voltage is greater than 1.25. Example: If 3.0V is the input, the MSB is 1, and the voltage sent to stage two is 0.5V Stage two checks to see if the voltage is greater than 1.25 The output bits are 1 0, which is the correct value.

  8. Pipeline ADC (cont.) We can design all of the stages to be identical if with the use of an amplifier.

  9. Other types of ADC • Folding • Time-interleaved • Algorithmic • Interpolating • Integrating-type More information can be found at: http://www.cse.psu.edu/~ikim/CourseWork/presentation/W8%20ADC.ppt

  10. Why pipelined? • Less comparators than flash • Flash uses 2n, pipelined uses # stages • Smaller • Less power • Resistor ladder difficult to implement in CMOS • Slower than flash, but still high speed

  11. Application What can we use this for? When completed, may be used for: • Software defined radio • Ultrasound pill • Others…

  12. Priorities for design In order of importance, highest first: • Speed • Accuracy • Error correction • Power • Area

  13. Specifications

  14. Project Schedule

  15. Conclusion Any comments or questions?

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