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Sensors 2013, 13(7), 8771-8785;

The Design of High Performance, Low Power Triple-Track Magnetic Sensor Chip

School of Electronic and Information Engineering, Anhui University, Hefei 230601, China
Department of Electrical Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
Author to whom correspondence should be addressed.
Received: 25 May 2013 / Revised: 1 July 2013 / Accepted: 1 July 2013 / Published: 9 July 2013
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [489 KB, uploaded 21 June 2014]


This paper presents a design of a high performance and low power consumption triple-track magnetic sensor chip which was fabricated in TSMC 0.35 μm CMOS process. This chip is able to simultaneously sense, decode and read out the information stored in triple-track magnetic cards. A reference voltage generating circuit, a low-cost filter circuit, a power-on reset circuit, an RC oscillator, and a pre-decoding circuit are utilized as the basic modules. The triple-track magnetic sensor chip has four states, i.e., reset, sleep, swiping card and data read-out. In sleep state, the internal RC oscillator is closed, which means that the digital part does not operate to optimize energy consumption. In order to improve decoding accuracy and expand the sensing range of the signal, two kinds of circuit are put forward, naming offset correction circuit, and tracking circuit. With these two circuits, the sensing function of this chip can be more efficiently and accurately. We simulated these circuit modules with TSMC technology library. The results showed that these modules worked well within wide range input signal. Based on these results, the layout and tape-out were carried out. The measurement results showed that the chip do function well within a wide swipe speed range, which achieved the design target. View Full-Text
Keywords: triple-track; magnetic sensor; decoder triple-track; magnetic sensor; decoder
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Wu, X.; Li, M.; Lin, Z.; Xi, M.; Chen, J. The Design of High Performance, Low Power Triple-Track Magnetic Sensor Chip. Sensors 2013, 13, 8771-8785.

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