A magnetic field to digital converter using PWM and TDC techniques
No Thumbnail Available
Date
2006-06-01
Authors
Chien-Hung Kuo
Shr-Lung Chen
Shen-Iuan Liu
Journal Title
Journal ISSN
Volume Title
Publisher
IET
Abstract
A high resolution magnetic-field-to-digital converter (MDC) is presented. It is composed
of a magnetic-field-to-pulse width converter (MPC), a cyclic pulse-shrinking time-to-digital
converter (TDC) and a polarity detector. This prototype circuit has been fabricated in a 0.5mm
CMOS DPDM process. With a clock rate of 16.6 kHz, the power consumption is 42.5 mW under
5 V supply voltage. The equivalent resolution less than 16mT can be achieved within the range of
710 mT. After off-line calibration, the remaining offset is 0.017 mT and its gain error is smaller
than 0.4%.