A New Fractional-N PLL Frequency Synthesizer. - Yasuaki Sumi; Shigeki Obote; Yutaka Fukui; Kazutoshi Tsuda; Kouichi Syoubu (J. Circuits Syst. Comput., 1997)

DSP-FLL for FSK demodulation. - Shigeki Obote; Yasuaki Sumi; Kouichi Syoubu; Yoshio Itoh; Yutaka Fukui (EUSIPCO, 1998)

PLL frequency synthesizer system utilizing multi-programmable dividers. - Yasuaki Sumi; Kouichi Syoubu; Shigeki Obote; Yutaka Fukui; Yoshio Itoh (EUSIPCO, 1998)