Variable gain amplifier in polar loop modulation transmitter for EDGE. - Masahiro Ito; Taizo Yamawaki; Masumi Kasahara; Steve Williams (ESSCIRC, 2005)

A 63-mA 112/94-dB DR IF bandpass ΔΣ modulator with direct feed-forward and double sampling. - Takaya Yamamoto; Masumi Kasahara; Tatsuji Matsuura (CICC, 2007)

ΔΣ PLL Transmitter With a Loop-Bandwidth Calibration System. - Yukinori Akamine; Manabu Kawabe; Kazuyuki Hori; Takao Okazaki; Masumi Kasahara; Satoshi Tanaka (IEEE J. Solid State Circuits, 2008)

A 63 mA 112/94 dB DR IF Bandpass ΔΣ Modulator With Direct Feed-Forward Compensation and Double Sampling. - Takaya Yamamoto; Masumi Kasahara; Tatsuji Matsuura (IEEE J. Solid State Circuits, 2008)