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Reduction of Kickback Noise in Latched Comparators for Cardiac IMDs

Affiliations

  • K. L. University, Green Fields, Vaddeswaram, Vijayawada - 522502, Andhra Pradesh, India

Abstract


Background/Objectives: The latched regenerative comparator is an essential block in all ADC architectures. It majorly suffers from the non-idealities such as kickback noise, thermal noise and offset voltage. Especially in an ADC implemented in Cardiac IMDs, the generated kickback noise in latched comparator can make a difference to the accuracy, resolution and settling time to an extent. The main objective of this work is to implement a technique for kickback noise reduction in latched comparators. Methods/Statistical Analysis: This work reviews the various architectures of latched comparators implemented in Cardiac IMDs and also make assessment of the available solutions to reduce the generated kickback noise in a latched comparator. The available kickback noise reduction techniques are implemented in SR latched dynamic comparators and resultant findings are compared. Findings: This brief proposes a new solution to cancel out the unwanted charge injections in the comparator and thus reduces the kickback noise effectively. The proposed solution is implemented in the latched comparator with SR latch and also compared with the already available solutions with regard to kickback noise and power dissipation. Application/Improvements: The proposed Kickback noise reduction technique reduces the noise to 40% more when compared with the other techniques and this technique is applicable to the dynamic Comparators used in Cardiac IMDs.

Keywords

Carddiac IMDs, Cmos Technology, Kickback Noise, Latched Comparator, Offset Voltage, Random Noise.

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References


  • Chandrakasan AP, Verma N, Daly DC. Ultralow-power electronics for biomedical applications. Annu Rev Biomed Engg. 2008 Apr.
  • Miyahara M, Asada Y, Paik D, Matsuzawa A. A low-noise self-calibrating dynamic comparator for high-speed ADCs. Proceedings of IEEE A-SSCC; 2008. p. 269–72.
  • Figueiredo P, et al. A 90 nm CMOS 1.2 V 6b 1GS/s two-step sub-ranging ADC. IEEE ISSCC Digest of Technical Papers. 2006; 1:568–9.
  • Der Plas GV, Decoutere S, Donnay S. A 0.16 pJ/conversion-step 2.5 mW 1.25 Gs/s 4b ADC in a 90 nm digital CMOS process. IEEE ISSCC Digest of Technical Papers; 2006. p. 2310–9.
  • Razavi B. Design of analog CMOS integrated circuits. New York: McGraw-Hill.
  • Park, J-H, Aoyama S, Watanabe T. A 0.1e- vertical FPN 4.7e- read noise 71 dB DR CMOS image sensor with 13b column-parallel single-ended cyclic ADCs. IEEE Digest of Technical Papers. 2006; 268–9.
  • Mashhadi SB, Lotfi R. Analysis and design of a low-voltage low-power double-tail comparator. IEEE Transactions on Very Large Scale Integrated Systems. 2014 Feb; 22(2).
  • Zhu Z, Liang Y. A 0.6-V 38-nW 9.4-ENOB 20-kS/s SAR ADC inv 0.18 um- CMOS for Medical Implant Devices. IEEE Journal of Solid State Circuits. 2015 Sep; 62(9).
  • Zhang D, Bhide A, Alvandpour A. A 53-nW 9.1-ENOB 1-KS/s SAR ADC in 0.13 um CMOS for medical implant devices. IEEE Journal of Solid State Circuits. 2012 Jul; 47(7).
  • Tang H, Sun ZC, Chew KWR, Siek L. A 5.8 nW 9.1-ENOB 1-kS/s local asynchronous successive approximation register ADC for implantable medical devices. IEEE Transactions on Very Large Scale Integration Systems. 2013 Oct.
  • Uyttenhove K, Steyaert M. A 1.8 V 6-bit 1.3-GHz flash ADC in 0.25 um CMOS. IEEE J Solid-State Circuits. 2003 Jul; 38(7):1115–22.
  • Kim S, Song M. An 8-bit 200MSPS CMOS A/D converter for analog interface module of TFT-LCD Driver. IEEE International Symposium on Circuits Systems. 2001 May; 1:528–31.
  • Figueiredo PM, Vital JC. Kickback noise reduction techniques for CMOS latched comparators. IEEE Transactions on Circuits and Systems-II. 2006 Jul; 53(7).
  • Lei K-M, Mak P-I, Martins RP. Systematic analysis and cancellation of kickback noise in a dynamic comparator. Analog Integrated Circuits and Signal Processing. 2013; 77:277–84.
  • Kimio T, Natarajan G, Hideki A, Taichi K, Nanao K. Higher involvement of subtelomere regions for chromosome rearrangements in leukemia and lymphoma and in irradiated leukemic cell line. Indian Journal of Science and Technology. 2012 Apr; 5 (1):1801–11.
  • Cunningham CH. A laboratory guide in virology. 6th ed. Minnesota: Burgess Publication Company; 1973.
  • Kumar E, Rajan M. Microbiology of Indian desert. Sen DN, editor. Ecology and Vegetation of Indian desert. India: Agro Botanical Publ; 1990. p. 83–105.
  • Rajan M, Rao BS, Anjaria KB, Unny VKP, Thyagarajan S. Radiotoxicity of sulfur-35. Proceedings of 10th NSRP; India. 1993. p. 257–8.
  • Available from: http://www.indjst.org/index.php/vision

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