Programmable of a Frequency for Concurrent Driving Signals of Touch Screen Controller

Abstract

The white paper provides simultaneous output sine wave generators using efficient memory access technology for large touch screen controllers. Sine waves of various frequencies are applied simultaneously to the touch screen controller. In memory, address values other than sine wave values are stored as samples. The range of the sine wave frequency and the interval between each frequency provide greater flexibility than conventional configuration methods by adjusting the address calculation algorithm to obtain sample values stored in memory. It also minimizes the amount of memory required by providing sample values from one memory to each sine wave generator to create all necessary sine waves. The sine wave generator was verified using Vivado, and the DAC built in the MaganChip 130mm CMOS process is defined and verified using Virtuoso and Spectre of Cadence.