Paper Info
Title
Noise cancellation techniques based on frequency selection OFDM and instrumentation sensing circuit for large touch screens
Abstract
This paper presents efficient double-noise suppression techniques for large form-factor mutual-capacitance touch screen panels (TSPs). Different carrier frequencies are applied to TSP concurrently using orthogonal frequency division multiplexing (OFDM), while the sensing lines are sensed sequentially. The proposed technique ensures a high frame scan rate by using simultaneous driving signals, and it provides a high signal to noise ratio (SNR) by avoiding frequency band with high noise power. The proposed instrumentation sensing circuit employs the recycling folded cascade (RFC) instrumentation amplifier, which has the benefits of rail-to-rail input and output swing, lower power consumption, with high DC gain compared to conventional FC. We designed and implemented the proposed sensing circuit in a 65 nm CMOS process technology. The experimental results show that the proposed technique improves the SNR of TSP by 28 dB compared to the conventional integrator based sensing circuits. Also, we show that the design consumes 6.9 mA with a supply voltage of 1.8 V.
Year
DOI
Venue
2016
10.1109/ICM.2016.7847935
2016 28th International Conference on Microelectronics (ICM)
Keywords
Field
DocType
Touch Screen Panel (TSP),frequency selection OFDM sensing,sensing circuit,SNR improvement,noise freeband,recycling folded cascode (RFC),Instrumentation amplifier
Noise power,Computer science,Frequency band,Signal-to-noise ratio,Integrator,Instrumentation amplifier,Electronic engineering,Active noise control,Electronic circuit,Electrical engineering,Orthogonal frequency-division multiplexing
Conference
ISSN
ISBN
Citations 
2159-1679
978-1-5090-5722-1
0
PageRank 
References 
Authors
0.34
3
2
Name
Order
Citations
PageRank
A. N. Ragheb100.68
Hyungwon Kim23014.13