標題: | A new adaptive front-end circuit for high-resolution magnetic scales |
作者: | Chien, Ping-Chieh Kao, Yung-Hua Chen, Hong-Yang Huang, Jing-Hao Chao, Paul C. -P. Wey, Chin-Long 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
關鍵字: | magnetic scales;optical scales;magnetic encoder IC;successive approximation register (SAR) analog-to-digital converters (ADC) |
公開日期: | 2015 |
摘要: | A new front-end readout circuit design using an adaptive amplifier is proposed by this study for magnetic and optical scales. The purpose of the integrated chip (IC) designed herein is to provide the magnetic/optical scales the capability of sensing translational or angular positions of an object in largely-arying amplitudes with high resolutions. Toward this end, a new front-end readout circuit is designed with two adaptive programmable gain amplifiers (PGAs) and two analog-to-digital converters (ADCs). The PGA is particularly designed to accept signals up to 1 MHz from MR sensor signals, which could be one of three voltage levels: 120 mVp-p, 250 mVp-p, 330 mVp-p. The resulted power consumption is 56 mW. The chip also includes a successive approximation register (SAR) ADC having two 12-bit channels for sine-to-digital conversions. The linearity of ADC achieve satisfactory performance (+/- 1LSB) in the input range of 0.5 similar to 2.5V in Vp-p. The chip was fabricated by the TSMC 0.35-icron 2P4M CMOS technology for verification. |
URI: | http://hdl.handle.net/11536/135967 |
ISBN: | 978-1-4799-8203-5 |
ISSN: | 1930-0395 |
期刊: | 2015 IEEE SENSORS |
起始頁: | 827 |
結束頁: | 830 |
顯示於類別: | 會議論文 |