Design flash adc 3bit (VHDL design)
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This document discusses the design of a 3-bit flash analog-to-digital converter (ADC). It begins by introducing flash ADCs and their advantages of high speed. A flash ADC uses 2n-1 comparators in parallel to convert an analog input to an n-bit digital code. The document then describes modeling a 3-bit flash ADC in VHDL, including the design of comparators using inputs A and B, and outputs for equal and greater signals. It also covers the use of a priority encoder. Finally, the document discusses another design approach to reduce power consumption by using fewer comparators.
![Reference
• [1] Design & Implementation of Low Power 3-bit Flash ADC in
0.18µm CMOS, Pradeep Kumar, Amit Kolhe, international Journal
of Soft Computing and Engineering (IJSCE)ISSN: 2231-2307,
Volume-1, Issue-5, November 2011.
• [2] https://en.wikipedia.org/wiki/Comparator
• [3] http://www.electronics-tutorials.ws/combination/comb_4.html
• [4] Design of a new 3-bit Flash Analog to Digital Converter
(ADC)E. O. Ogunti and F. J. OmotayoDepartment of
Electrical/Electronic Engineering Federal University of Technology,
Akure, Nigeria](https://image.slidesharecdn.com/designflashadc-150709021816-lva1-app6891/85/Design-flash-adc-3bit-VHDL-design-19-320.jpg)
Design flash adc 3bit (VHDL design)
- 2. Why we used ADC? What is the main types of ADC? Which design we will use ?
- 3. Model 1 Digital (VHDL) Model 2 with minimum power Flash ADC
- 4. Model1 Design Flash ADC concept of Flash ADC: The flash ADC is a fastest speed compared to other ADC architectures. The flash ADC is also known as the parallel ADC because of its parallel architecture.
- 5. • it is used for high-speed and very large bandwidth applications such as radar processing, digital oscilloscopes
- 6. Flash ADC block diagram
- 7. The Main component of flash ADC design:
- 8. • these architecture needs 2n -1 comparators for a n-bit ADC; for example, a set of 7 comparators is used for 3-bit flash ADC. Each comparator has a reference voltage that is provided by an external reference source. • For instance, a 6-bit flash ADC needs 63 comparators, but 1023 comparators are needed for a 10-bit flash ADC
- 10. The design of comparator: • Ai, Bi : Inputs to be compared • Ein = "1" : It indicates that A and B in previous comparison are equal to each other • Gin = "1" : It indicates that A is greater than B in previous comparison • Eout= "1" : It indicates that the inputs are equal to each other • Gout= "1" : It indicates that A is greater than B
- 12. • in the design the operation of comparator to be greater than values only then we will use the Gout equation only and will be • Gout=Gin+AiBi′ Note that
- 13. The design of Priority Encoder:
- 14. VHDL Simulation
- 15. VHDL Simulation
- 16. That compare between normal design of flash and another analogue design to get lowest power consumption Resolution and circuit complexity causing high power consumption are the major problems with Flash ADC, and these have limited its application despite its speed of conversion, which is the fastest among all types of Analog to Digital Converters”. Model2 “Design Flash ADC with Low power ”
- 17. Two comparators were successfully used instead of seven which resulted in 92% reduction in power consumption. Old design New design 2n-1 2n-3
- 19. Reference • [1] Design & Implementation of Low Power 3-bit Flash ADC in 0.18µm CMOS, Pradeep Kumar, Amit Kolhe, international Journal of Soft Computing and Engineering (IJSCE)ISSN: 2231-2307, Volume-1, Issue-5, November 2011. • [2] https://en.wikipedia.org/wiki/Comparator • [3] http://www.electronics-tutorials.ws/combination/comb_4.html • [4] Design of a new 3-bit Flash Analog to Digital Converter (ADC)E. O. Ogunti and F. J. OmotayoDepartment of Electrical/Electronic Engineering Federal University of Technology, Akure, Nigeria