Open AccessFully‐VCO‐based 0‐2 MASH CT ΔΣ ADC
Author(s) -
Xing Xinpeng,
Zhu Peng,
Liu Hui,
Gielen Georges
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2018.1284
Subject(s) - voltage controlled oscillator , integrator , noise shaping , cmos , figure of merit , electronic engineering , delta sigma modulation , bandwidth (computing) , phase noise , electrical engineering , integrating adc , successive approximation adc , dynamic range , analog to digital converter , computer science , physics , voltage , capacitor , engineering , telecommunications , optoelectronics , ćuk converter
A fully‐voltage‐controlled oscillator (VCO)‐based continuous‐time (CT) Delta‐Sigma (ΔΣ) analogue‐to‐digital converter (ADC) is reported, implementing second‐order noise shaping without any analogue integrators. Traditional power‐hungry front‐end analogue integrator is replaced by a highly‐digital power‐efficient VCO‐based integrator, which is constructed by a VCO, a phase detector and a charge pump. The quantisation is executed by a VCO‐based quantiser with intrinsic noise shaping. Taking advantage of the mostly‐digital and high‐order structure, a spurious‐free dynamic range of 74 dB and a figure‐of‐merit of 52 fJ/step over a 40 MHz bandwidth are achieved by a 0‐2 multi‐stage shaping (MASH) demonstration in 40 nm CMOS.