Browsing by Author "Hong, HP"

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A reverse-voltage protection circuit for MOSFET power switches
(2001-01-01)
Hong, HP
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Wu, JC
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
When MOSFET is used as a power switch, if is essential to prevent reverse current flow through the parasitic body diodes under reverse voltage condition. A new built-in reverse voltage protection circuit for MOSFETs has been developed. In this design, an area-efficient circuit is used to automatically select the proper well bias voltage to prevent reverse current under the reverse-voltage condition. This built-in reverse protection circuit has been successfully implemented in a high-side power switch application using a 0.6-mum CMOS process. The die area of the protection circuit is only 2.63 % of that of a MOSFET. The latch-up immunity is greater than +12 V and -10 V in voltage triggering mode, and greater than +/-500 mA in current triggering mode, The protection circuit is not in series with the MOSFET switch, so that the full output swing and high power efficiency are achieved.
The controller IC for modified active addressing STN LCDs
(1997)
Hong, HP
;
Wu, JC
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交大名義發表
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電機學院
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National Chiao Tung University
A modified active addressing technique, which combines the ideas of PHM active addressing and subgroup, is proposed to make possible high-brightness, high-contrast, gray-scale, low-voltage, and low-cost STN displays. Based on this technique, a driver controller for 240x640 STN LCDs is implemented into an IC.