OTA를 이용한 단전원 구동 펄스폭 변조

Abstract

OTA를 이용한 단전원 구동 펄스폭 변조 회로를 설계함. This paper proposes a PWM(Pulse Width Modulation) circuit using CMOS OTA with a single-voltage supply. The OTA employed has an input stage which consists of a pair of two MOSFETs operating in plural operation regions. The MOSFETs work complemetarily and realize a rail-to-rail input stages because the input stage is realized by single channel type MOSFETs. In order to confirm the validity of the proposed circuit, it is simulated by H-SPICE program. Furthermore, the proposed circuit will be integrated on chip using 0.35µm CMOS technology.