High Speed High Resolution Current Comparator and its Application to Analog to Digital Converter

被引：10
作者：
Sridhar R. [1 ]
Pandey N. [1 ]
Bhattacharyya A. [1 ]
Bhatia V. [2 ]
机构：
[1] Department of Electronics and Communication Engineering, Delhi Technological University, Delhi
[2] Department of Electronics and Communication Engineering, Indira Gandhi Delhi Technical University for Women, Delhi
来源：
Journal of The Institution of Engineers (India): Series B | 2016年 / 97卷 / 2期
关键词：
ADC; Comparators; Current mode; Nonlinear feedback;
D O I：
10.1007/s40031-015-0189-1
中图分类号：
学科分类号：
摘要：
This paper introduces a high speed high resolution current comparator which includes the current differencing stage and employs non linear feedback in the gain stage. The usefulness of the proposed comparator is demonstrated by implementing a 3-bit current mode flash analog-to-digital converter (ADC). Simulation program with integrated circuit emphasis (SPICE) simulations have been carried out to verify theoretical proposition and performance parameters of both comparator and ADC are obtained using TSMC 0.18 µm CMOS technology parameters. The current comparator shows a resolution of ±5 nA and a delay of 0.86 ns for current difference of ±1 µA. The impact of process variation on proposed comparator propagation delay has been studied through Monte Carlo simulation and it is found that percentage change in propagation delay in best case is 1.3 % only and in worst case is 9 % only. The ADC exhibits an offset, gain error, differential nonlinearity (DNL) and integral nonlinearity (INL) of 0.102 µA, 0.99, −0.34 LSB and 0.0267 LSB, respectively. The impact of process variation on ADC has also been studied at different process corners. © 2015, The Institution of Engineers (India).
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页码：147 / 154
页数：7
相关论文
共 17 条
  • [1] Banks D.J., Degenaar P., Toumazou C., Distributed current mode image processing filters, Electron. Lett., 41, pp. 1201-1202, (2005)
  • [2] Vzassis S., Siskos S., High speed and high resolution WTA circuit, in Proceedings of International Symposium on Circuit and Systems, pp. 224-227, (1999)
  • [3] Demosthenous A., Taylor J., 2.8 V asynchronous high speed current comparator for sequence detection applications, Electron. Lett., 34, pp. 1714-1715, (1998)
  • [4] Baru M., Oliveira O., Silveira F., A 2 V rail-to-rail micropower CMOS comparator, J. Solid-State Devices Circuits Braz. Microelectron. Soc., 5, pp. 9-13, (1997)
  • [5] Freitas O.A., Current K.W., CMOS current comparator circuit, Electron. Lett., 19, pp. 695-697, (1983)
  • [6] Traff H., Novel approach to high speed CMOS current comparators, Electron. Lett., 28, pp. 310-312, (1992)
  • [7] Tang A.T.K., Toumazou C., High performance CMOS current comparator, Electron. Lett., 30, pp. 5-6, (1994)
  • [8] Rodriguez-Vasquez A., Dominguez-Castro R., Medeiro F., Delgado- Restituto M., High resolution CMOS current comparators: design and applications to current-mode function generation, Analog Integr. Circuits Signal Process., 7, pp. 149-165, (1995)
  • [9] Ravezzi L., Stoppa D., Dalla Betta G.F., Simple high-speed CMOS current comparator, Electron. Lett., 33, pp. 1829-1830, (1997)
  • [10] Min B.M., Kim W., High performance CMOS current comparator using resistive feedback network, Electron. Lett., 34, pp. 2074-2076, (1998)
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