Open AccessEstimation and compensation methods of time delay and phase offset in hybrid filter bank DACs
Author(s) -
Yang Xing,
Wang Houjun,
Liu Ke
Publication year - 2018
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.2018.0937
Subject(s) - control theory (sociology) , linear phase , group delay and phase delay , inverse trigonometric functions , offset (computer science) , mathematics , computer science , trigonometric functions , phase distortion , algorithm , electronic engineering , filter (signal processing) , engineering , mathematical analysis , geometry , control (management) , artificial intelligence , computer vision , programming language
This Letter studies the non‐ideal analogue filters performance, time delay and phase offset in hybrid filter bank (HFB) DACs. After compensating the non‐ideal filters performance using a digital signal, a linear phase function containing time delay and phase was deduced based on the auto‐power spectrum of the HFB DAC output in the overlapped frequency band. ‘Three‐point’ method was used to simultaneously estimate these two errors by unwrapping the phase affected the principal value interval of the inverse trigonometric function. These two errors were compensated by the digital pre‐distortion technique. Finally, simulation results were provided to verify the effectiveness of this proposed method.