A new adaptive front-end circuit for high-resolution magnetic scales

Ping Chieh Chien, Yung Hua Kao, Hong Yang Chen, Jing Hao Huang, Chang-Po Chao, Chin Long Wey

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


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-varying 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∼2.5V in Vp-p. The chip was fabricated by the TSMC 0.35-micron 2P4M CMOS technology for verification.

Original languageEnglish
Title of host publication2015 IEEE SENSORS - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479982028
StatePublished - 31 Dec 2015
Event14th IEEE SENSORS - Busan, Korea, Republic of
Duration: 1 Nov 20154 Nov 2015

Publication series

Name2015 IEEE SENSORS - Proceedings


Conference14th IEEE SENSORS
CountryKorea, Republic of


  • magnetic encoder IC
  • magnetic scales
  • optical scales
  • successive approximation register (SAR) analog-to-digital converters (ADC)

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