Do-youb Kim | Researchain

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international solid-state circuits conference | 2007

An 8b Source Driver for 2.0 inch Full-Color Active-Matrix OLEDs Made with LTPS TFTs

Yong-sung Park; Do-youb Kim; Keum-Nam Kim; Yojiro Matsueda; Jong-Hyun Choi; Chul-Kyu Kang; Hye-Dong Kim; Ho Kyoon Chung; Oh-Kyong Kwon

An 8b source driver for 2.0 inch QVGA active-matrix OLEDs is fabricated using LTPS TFTs. This driver uses an 8b DAC that is separated into two parts, a 1-to-3 DEMUX, and a pre-charge method. This scheme reduces the source driver size by 40%. The maximum DNL is under 1LSB. The output voltage variation of the source driver is less than 1 LSB even though the variation of the threshold voltage is plusmn0.5V

international solid-state circuits conference | 2003

A 1.0 V 256 Mb SDRAM with offset-compensated direct sensing and charge-recycled precharge schemes

Jae-Yoon Sim; Kee-Won Kwon; Jung-Hyun Choi; Sung-Yeon Lee; Do-youb Kim; Hyong-Ryol Hwang; Ki Chul Chun; Youngil Seo; Hong-Sun Hwang; Dongjoo Seo; Chun-Sup Kim; Sungwee Cho

A 1.0 V, 256 Mb SDRAM is designed in a 0.1 /spl mu/m CMOS technology. For low voltage applications, an offset compensated direct current sensing scheme improves refresh time as well as sensing performance. A charge-recycled precharge reuses the word-line discharge current to generate the boosted voltage required for equalization without charge pumping. At 1.0 V, the access time is 25 ns and the current is 15 mA.

Archive | 2010