Implementation of Flash ADC using Multisim Technology

International Journal of Computer Trends and Technology (IJCTT)          
© - June Issue 2013 by IJCTT Journal
Volume-4 Issue-6                           
Year of Publication : 2013
Authors :Raghavendra.R, Dr S.A Hariprasad


Raghavendra.R, Dr S.A Hariprasad "Implementation of Flash ADC using Multisim Technology"International Journal of Computer Trends and Technology (IJCTT),V4(6):1825-1830 June Issue 2013 .ISSN Published by Seventh Sense Research Group.

Abstract: - Resolution, Speed, and Power consumption are the three key parameters for an Analog-to-Digital Converter (ADC) and Flash ADCs are the fastest type of ADC. In this paper an effort is made to design 3-bit and 8-bit Flash ADC using multisim. Flash ADC very useful for high-speed applications such as radar detection, wide band radio receivers and communication links. More often the flash ADC is embedded in a large IC containing many digital decoding functions. The integrated flash ADC is operated at 3 and 8-bit precision with analog input voltage of -10.0Vdc to +10.0Vdc. The ADC has been designed, implemented & analysed using Multisim tool and this paper provides a detailed view of a 3 bit and an 8 bit Flash ADC using comparators, 7segment display (Hex value) and actual working explanation about Flash ADC with step by step accurate simulated output using Multisim. The simulated output shows higher range of accuracy (seven digits) is obtained when Flash ADC is experimented in Multisim. Multisim offers additional features such as ease of implementation, rebuild and cost reduction when compared to practical simulation of Flash ADC.


[1] S.Padoan, A.Boni, C.Morandi, F Venturi, “A novel coding schemes for the ROM of parallel ADCs, featuring reduced conversion noise in the case of single bubbles in the thermometer code”, IEEE International Conference on Circuits and Systems, vol. 2, pp. 271-274, Sep. 1998.
[2] Efficient Circuit Configuration for Enhancing Resolution of 8-bit flash Analog to Digital Convertor IJCSI International Journal of Computer Science Issues, Vol. 9, Issue 6, No 3, November 2012
[3] Book Analog Electronics LK Maheswari MMS Anand – 2008
[4] S. Mahata, A. Maiti,and C. K. Maiti, “Cost-EffectiveWeb-Based Electronics Laboratory Using NI MultiSim, LabVIEW and ELVIS II”, IEEE Journal, pp 242-243, 2010
[5] Multisim Lab manual 2007 Dr. Julio R Gancia
[6] A Dual-Slope Integration Based Analog-to-Digital Convertor American J. of Engineering and Applied Sciences 2 (4): 743-749, 2009 ISSN 1941-7020 © 2009 Science Publications
[7] Texas Instruments Incorporated, 1985. The TTL Data Book-Standard TTL. Schottky, Low-Power Schottky Circuits, Vol. 2, ISBN: 0-89512-096-8, 1985.

Keywords Flash ADC, Comparator, Encoder, Hex, Resolution, 3and 8Bit, Multisim.