Title :
The design of 13 bits ΣΔ ADC for a mutual-capacitance large touch screen controller
Author :
Albittar, Ihsan F. I. ; Jiho Kim ; HyungWon Kim
Author_Institution :
Dept. of Electron. Eng., Chungbuk Nat. Univ., Cheongju, South Korea
Abstract :
Touch sensing circuits for large touch screens require high resolution ADCs with high data rate for accurate and fast touch detection. This paper presents a third-order ΣΔ ADC design with an input bandwidth of 480 KHz at 61.44 MHz sampling frequency, the SNR and ENOB are measured to be 85 dB and 13 bits respectively. We present an efficient mixed signal design methodology consisting of circuit design, integration, and verification with analog and digital simulations. Using the proposed design methodology, the target ΣΔ ADC design is implemented with Dongbu 0.18-μm BDCMOS technology. The design results show its suitability for large mutual-capacitance touch screen controller applications.
Keywords :
CMOS integrated circuits; capacitive sensors; integrated circuit design; sigma-delta modulation; tactile sensors; touch sensitive screens; Dongbu BDCMOS technology; ENOB; SNR; analog simulation; bandwidth 480 kHz; digital simulation; frequency 61.44 MHz; mixed signal design methodology; mutual-capacitance large touch screen controller; noise figure 85 dB; size 0.18 mum; third-order ΣΔ ADC design; touch detection; touch sensing circuit; word length 13 bit; Capacitance; Digital simulation; Frequency measurement; Modulation; Sensors; Signal to noise ratio; Switches; Sigma-delta ADC; desgin methodology; touch screen controller;
Conference_Titel :
SoC Design Conference (ISOCC), 2014 International
DOI :
10.1109/ISOCC.2014.7087554
