A 6.3 mW high-SNR frame-rate scalable touch screen panel readout IC with column-parallel Σ-Δ ADC structure for mobile devices

Author

Jun-Eun Park ; Dong-Hyuk Lim ; Deog-Kyoon Jeong

Author_Institution

Dept. of Electr. & Comput. Eng., Seoul Nat. Univ., Seoul, South Korea

fYear

2013

fDate

11-13 Nov. 2013

Firstpage

357

Lastpage

360

Abstract

This paper presents a capacitive touch screen panel (TSP) readout IC that provides highly enhanced signal-to-noise ratio (SNR) and scalable frame rate. To increase touch sensitivity and noise immunity, the proposed readout IC employs a differential sensing method. A column-parallel incremental sigma-delta (Σ-Δ) ADC structure is adopted to obtain high frame rate and its scalability. The readout IC is fabricated in 0.18-μm CMOS process and its active area is 2.2 mm2. The measured results show that the readout IC achieves 60-dB SNR and 200-Hz frame rate with 12 × 8 mutual capacitive TSP. The frame rate and SNR can be adjusted from 50 Hz to 1.6 kHz and from 50 dB to 67 dB, respectively. The power consumption is 6.3 mW with 3.3-V supply.

Keywords

CMOS integrated circuits; mobile handsets; readout electronics; sigma-delta modulation; touch sensitive screens; CMOS process; capacitive touch screen panel; column-parallel Σ-Δ ADC structure; column-parallel incremental sigma-delta ADC structure; differential sensing method; frequency 50 Hz to 1.6 kHz; high-SNR frame-rate scalable touch screen panel readout IC; mobile devices; noise immunity; power 6.3 mW; scalable frame rate; signal-to-noise ratio; size 0.18 mum; touch sensitivity; voltage 3.3 V; Capacitance; Integrated circuits; Modulation; Sensitivity; Sensors; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference (A-SSCC), 2013 IEEE Asian

Conference_Location

Singapore

Print_ISBN

978-1-4799-0277-4

Type

conf

DOI

10.1109/ASSCC.2013.6691056

Filename

6691056