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http://dx.doi.org/10.17661/jkiiect.2020.13.3.184

A Single-Bit 2nd-Order CIFF Delta-Sigma Modulator for Precision Measurement of Battery Current  

Bae, Gi-Gyeong (R&D Center, PIXELPLUS)
Cheon, Ji-Min (School of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.13, no.3, 2020 , pp. 184-196 More about this Journal
Abstract
In this paper, a single-bit 2nd-order delta-sigma modulator with the architecture of cascaded-of-integrator feedforward (CIFF) is proposed for precision measurement of current flowing through a secondary cell battery in a battery management system (BMS). The proposed modulator implements two switched capacitor integrators and a single-bit comparator with peripheral circuits such as a non-overlapping clock generator and a bias circuit. The proposed structure is designed to be applied to low-side current sensing method with low common mode input voltage. Using the low-side current measurement method has the advantage of reducing the burden on the circuit design. In addition, the ±30mV input voltage is resolved by the ADC with 15-bit resolution, eliminating the need for an additional programmable gain amplifier (PGA). The proposed a single-bit 2nd-order delta-sigma modulator has been implemented in a 350-nm CMOS process. It achieves 95.46-dB signal-to-noise-and-distortion ratio (SNDR), 96.01-dB spurious-free dynamic range (SFDR), and 15.56-bit effective-number-of-bits (ENOB) with an oversampling ratio (OSR) of 400 for 5-kHz bandwidth. The area and power consumption of the delta-sigma modulator are 670×490 ㎛2 and 414 ㎼, respectively.
Keywords
Analog-to-digital converter; battery management system; CIFF; current sensing; delta-sigma modulator;
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