Open AccessTwo‐step, piecewise‐linear SAR ADC with programmable transfer function
Author(s) -
Sengupta S.,
Johnston M.L.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.0138
Subject(s) - transfer function , successive approximation adc , piecewise linear function , computer science , bandwidth (computing) , shaping , piecewise , electronic engineering , range (aeronautics) , cmos , mathematics , engineering , voltage , electrical engineering , capacitor , telecommunications , mathematical analysis , geometry , aerospace engineering
A 7‐bit successive approximation register (SAR) analogue‐to‐digital converter (ADC) with programmable transfer functions is presented. Building upon prior art, a two‐step successive approximation technique is used to implement a piecewise‐linear approximation of the desired transfer function. However, unlike previous implementations of SAR‐based non‐linear ADCs, the proposed work demonstrates programmability of arbitrary non‐linear transfer functions, thus making it suitable for a wide range of low‐bandwidth applications. Simulation results from a proof‐of‐concept design in a standard 180 nm CMOS process are presented to validate the proposed idea.