Open AccessEfficient CTDSM based on GM‐C quantiser and improved dynamic element matching
Author(s) -
Sahu Anil Kumar,
Chandra Vivek Kumar,
Sinha Ganesh Ram,
Kumar Misra Neeraj
Publication year - 2020
Publication title -
iet circuits, devices and systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.251
H-Index - 49
ISSN - 1751-8598
DOI - 10.1049/iet-cds.2019.0404
Subject(s) - spurious free dynamic range , integrator , dynamic range , delta sigma modulation , bandwidth (computing) , physics , noise shaping , electronic engineering , noise (video) , cmos , converters , power (physics) , algorithm , computer science , engineering , telecommunications , quantum mechanics , artificial intelligence , image (mathematics)
In this study, a continuous‐time delta‐sigma modulator (CTDSM) is developed using a Gm‐C based noise‐shaping quantiser (Gm‐C‐NSQ) with an improved dynamic element matching (i‐DEM) algorithm. Here, a Gm‐C integrator is used to develop NSQ, since it increases the effectiveness of the proposed modulator in terms of power consumption and die area. This Gm‐C‐NSQ uses only three dynamic latches to provide efficient quantisation level and to increase the order of noise shaping. Moreover, an i‐DEM algorithm is utilised to reduce the non‐linearities of the quantiser and mismatching error of the digital‐to‐analogue converters presented in the feedback structure of the modulator. Here, an 180 nm CMOS technology is used to design the proposed modulator and it functions at 2.6 MHz sampling frequency. Simulation results show that the proposed modulator can achieve a peak spurious‐free dynamic range (SFDR) of 93.67 dB and a peak signal‐to‐noise ratio of 87.38 dB for 20 kHz signal bandwidth. Furthermore, the proposed modulator consumes 0.0863 mW power when 1.2 V supply voltage is applied.