Title :
5.2 A 110dB SNR ADC with ±30V input common-mode range and 8μV Offset for current sensing applications
Author :
Long Xu ; Gonen, Burak ; Qinwen Fan ; Huijsing, Johan H. ; Makinwa, Kofi A. A.
Author_Institution :
Delft Univ. of Technol., Delft, Netherlands
Abstract :
This paper presents a high-resolution 110dB SNR ΔΣ ADC that achieves a ±30V input common-mode voltage range (CMVR) while powered from a single 5V supply. This beyond-the-rails capability is obtained by employing a capacitively coupled high-voltage (HV) chopper at the input of a switched-capacitor (SC) ΔΣ ADC. Furthermore, the use of correlated double sampling and system-level chopping results in a maximum offset of 8uV over the full CMVR. In contrast to a recent HV ADC [1], the ADC exhibits 30dB more resolution, while its CMVR extends below the negative rail.
Keywords :
amplifiers; choppers (circuits); delta-sigma modulation; electric current measurement; electric sensing devices; switched capacitor networks; SNR ΔΣ ADC; common-mode voltage range; correlated double sampling; current sensing amplifier; high-voltage chopper; input CMVR; switched-capacitor ΔΣ ADC; system-level chopping; voltage 5 V; voltage 8 muV; Accuracy; Capacitors; Choppers (circuits); Clocks; Modulation; Monitoring; Signal to noise ratio;
Conference_Titel :
Solid- State Circuits Conference - (ISSCC), 2015 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4799-6223-5
DOI :
10.1109/ISSCC.2015.7062940
