Open AccessMixed capacitor switching scheme for SAR ADC with highest switching energy efficiency
Author(s) -
Ni Yabo,
Liu Lu,
Xu Shiliu
Publication year - 2015
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.2014.4019
Subject(s) - capacitor , successive approximation adc , energy (signal processing) , computer science , electronic engineering , monotonic function , energy consumption , shaping , voltage , electrical engineering , mathematics , engineering , mathematical analysis , statistics
A high energy‐efficiency mixed capacitor switching scheme is proposed for the successive approximation register (SAR) analogue‐to‐digital converter (ADC). The new switching scheme combines a new switching method, monotonic switching method and split‐capacitor technique. The new switching method achieves no switching energy consumption until the fourth comparison, and the low‐power monotonic switching method is utilised for the remaining comparisons. Moreover, fewer bit capacitors are needed at the same resolution because of the split‐capacitor technique. The proposed method achieves a 99.4% reduction in switching energy when compared with the conventional SAR architecture.