A 30-MHz mixed analog/digital signal processor. - Sumitaka Takeuchi; Hiroyuki Kouno; Yoshinori Hayashi; Atsushi Maeda; Keisuke Okada; Nobuharu Yazawa (IEEE J. Solid State Circuits, 1990)

A design of high-performance multiplier for digital video transmission. - Keisuke Okada; Shun Morikawa; Isao Shirakawa; Sumitaka Takeuchi (ASP-DAC, 1995)

A high performance FIR filter dedicated to digital video transmission. - Shun Morikawa; Keisuke Okada; Sumitaka Takeuchi; Isao Shirakawa (ASP-DAC, 1997)

A multilevel QAM demodulator VLSI with wideband carrier recovery and dual equalizing mode. - Kazuya Yamanaka; Sumitaka Takeuchi; Shuji Murakami; Masayuki Koyama; Jun Ido; Takashi Fujiwara; Susumu Hirano; Keisuke Okada; Tadashi Sumi (IEEE J. Solid State Circuits, 1997)