國立臺灣師範大學電機工程學系Chien-Hung KuoShr-Lung ChenShen-Iuan Liu2014-10-302014-10-302004-04-011530-437Xhttp://rportal.lib.ntnu.edu.tw/handle/20.500.12235/32204In this paper, two magnetic-to-digital converters (MDCs) using single-amplifier-based second-order delta–sigma modulators (DSMs) are presented to detect the dc magnetic field. The proposed second-order DSM required only a single-operational amplifier to achieve the second-order noise shaping. Both the proposed circuits have been fabricated in a 0.5- m CMOS DPDM process, and the resolution of 11 bits can be achieved. The measured sensitivities are 1.486 and 0.459 mV/mT, and the minimum detectable magnetic fields are 0.6 mT and 0.4 mT for the MDC with and without the pre-amplifier, respectively. Both the measured nonlinearities are smaller than 1.3% within the range of 100 mT.CMOSdelta–sigma modulator (DSM)magnetic sensor