Open AccessCharge pump‐ and VCO‐based second‐order delta‐sigma ADC
Author(s) -
Xing Xinpeng,
Zhu Peng,
Liu Hui,
Liu Ye,
Gielen Georges
Publication year - 2016
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.2016.1035
Subject(s) - voltage controlled oscillator , integrator , delta sigma modulation , noise shaping , physics , cmos , sigma , electrical engineering , bandwidth (computing) , noise (video) , electronic engineering , voltage , engineering , optoelectronics , computer science , telecommunications , quantum mechanics , artificial intelligence , image (mathematics)
A low‐power charge pump‐ and VCO‐based delta‐sigma ADC is presented, realising second‐order noise shaping without any analogue integrator. The proposed synchronous pulse‐width modulator ‐driven charge pump replaces an analogue integrator in delta‐sigma ADC power efficiently. Together with the noise shaping provided by the VCO in the quantiser, an analogue‐less 2nd‐order delta‐sigma ADC is obtained. The simulation results in 90 nm CMOS show that the proposed charge pump‐ and VCO‐based delta‐sigma ADC achieves 78.7 dB signal‐to‐noise ratio and 74.2 dB signal‐to‐noise and distortion ratio for a bandwidth of 2 MHz, consuming 2.95 mW, corresponding to a FoM of 0.18 pJ/conv.