Design of 6-Bit Two-step Flash ADC for High Speed and Low Power Applications

Autor/innen

  • Navhakar Rahul Shivaji Department of Electrical Engineering, IIT Kanpur
  • Mohammad Waseem Akram Department of Electrical Engineering, IIT Kanpur
  • Bahniman Ghosh Department of Electrical Engineering, IIT Kanpur

Schlagwörter:

Two-step Flash ADC, sample and hold circuit, comparator, residue amplifier, current steering DAC

Abstract

In this paper, 6-bit two-step Flash ADC operated at the 2 GS/s is designed, with optimized performance for frequency domain applications. To get the best performance, the coarse convertor of 2-bit and the fine convertor of 4-bit are chosen. The comparator design is done with optimum power and area with two power supplies. Intermediate state accuracy increased by thermometer coded current steering DAC. The DNL and INL specifications are chosen to be 0.8 LSB and 0.9 LSB respectively. For a sampling frequency of 2 GS/s, the SFDR is greater than 47 dbc for the signal from dc to 70 MHz and the SNR is greater than 34 dB. The power consumption is only 9.35 mW, and figure of merit equals to 0.146 (pJ/step) at the power supplies of 1.8 V and 0.75 V. The key building blocks like sample and hold circuit, comparator, residue amplifier, current steering DAC are designed. Layout and simulation of functional element at the block level is performed. All the designs are done in 180 nm CMOS technology from UMC Cadence EDA tool suite. Keywords: Two-step Flash ADC, sample and hold circuit, comparator, residue amplifier, current steering DAC

Autor/innen-Biografien

  • Navhakar Rahul Shivaji, Department of Electrical Engineering, IIT Kanpur
    Department of Electrical Engineering, IIT Kanpur
  • Mohammad Waseem Akram, Department of Electrical Engineering, IIT Kanpur
    Department of Electrical Engineering, IIT Kanpur
  • Bahniman Ghosh, Department of Electrical Engineering, IIT Kanpur
    Department of Electrical Engineering, IIT Kanpur

Downloads

Veröffentlicht

2012-06-11

Ausgabe

Bd. 3 Nr. 1 (2012)

Rubrik

Research Articles

Lizenz

Declaration and Copyright Transfer Form

(to be completed by authors)

 

I/ We, the undersigned author(s) of the submitted manuscript, hereby declare, that the above manuscript which is submitted for publication in the STM Journals(s), is not published already in part or whole (except in the form of abstract) in any journal or magazine for private or public circulation, and, is not under consideration of publication elsewhere.

·         I/We will not withdraw the manuscript after 1 week of submission as I have read the Author Guidelines and will adhere to the guidelines.

·         I/We Author(s ) have niether given nor will give this manuscript elsewhere for publishing after submitting in STM Journal(s).

·         I/ We have read the original version of the manuscript and am/ are responsible for the thought contents embodied in it. The work dealt in the manuscript is my/ our own, and my/ our individual contribution to this work is significant enough to qualify for authorship.

·          I/We also agree to the authorship of the article in the following order:

Author’s name                                    

 

1. ________________

2. ________________

3. ________________

4. _______________

 

We  Author(s) tick this box and would request you to consider it as our signature as we agree to the terms of this Copyright Notice, which will apply to this submission if and when it is published by this journal.