Institute of Information Technology Assessment

Ad Semiconductor Co., Ltd.

Tachyonics Corp.

Jae Hong Joo

Jin Sung Choi

Min Sung Yang

Kwang Deok Park

Sang Bo Cheong

Sang Chuel Lee

Kee Cheol Ahn

Seong Hyun Nam

Kyong Ryol Kim

The present invention relates to a resistive touchscreen for recognizing touch coordinates through a capacitor charging time constant, and more specifically, the invention comprises: an equal resistance line operating means for obtaining the same resistance line according to an (R+R) value and the same resistance line according to an (R+R) value by using the charge time constant after a charge time constant measuring means measures charge time constants of capacitors CL and CR; and a coordinate calculating means for obtaining intersecting points of the resistance lines, thereby perceiving the intersecting points as touch positions. According to the present invention, a conventional ADC (analog to digital converter) is not used because the touch positions can be perceived through the capacitor charging time constants, whereby the invention is advantageous for IC integration.

Multi-touch recognition resistive touch screen for recognizing multi-touch coordinates through capacitor charging time

The present invention relates to a high-frequency power amplifier having differential inputs, and more specifically to a high-frequency power amplifier having differential inputs, in which a structure of an output port of a communication system for 2.4 GHz ISM frequency band can be simplified by designing and producing the high-frequency power amplifier having differential inputs for 2.4 GHz ISM frequency band using a silicon germanium (SiGe) microwave monolithic integrated circuit (MMIC), thereby decreasing the number of components of a transmission unit and reducing a price of the communication system.

High-frequency power amplifier having differential inputs

Growing community of inventors

Seoul, South Korea

Jae Hong Joo