A Delta-Sigma-Modulation Multi-Channel Network with Improved Noise-Shaping Characteristics. - Tomoaki Koizumi; Takao Waho; Hitoshi Hayashi (ISCAS, 2021)

A multi-level cascaded delta-sigma modulator with reduced quantization noise leakage. - Takao Waho; Tomoaki Koizumi; Hitoshi Hayashi (ISMVL, 2021)

A ΔΣ-Modulation Feedforward Network for Non-Binary Analog-to-Digital Converters. - Takao Waho; Tomoaki Koizumi; Hitoshi Hayashi (IEICE Trans. Inf. Syst., 2021)