Li-gang Hou

Beijing University of Technology, Peping, Beijing, China

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Publications (4)0 Total impact

  • Li-gang Hou · Xiao-hong Peng · Wu-chen Wu
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    ABSTRACT: This paper forwards a low power design of a grating detection system chip (GDC) on length and angle precision measurement. Traditional grating detection methods are complex, costly, and suffer big power consumption for the complex divide circuit scheme and CPU software compensation. GDC achieves the whole grating detection system function, high speed orthogonal signal handling in a single chip with very low power consumption. It is an application-specific integrated circuit (ASIC), integrated micro controller unit (MCU), power management unit (PMU), two LCD controller, keyboard interface, grating detection unit and other peripherals. Working at 10 MHz, GDC can afford 5 MHz internal sampling rate and 1.25 MHz orthogonal signal from grating sensor. By implementing low power system design, orthogonal signal dividing and Low power divider design, GDC consumes 0.9 mw in test mode and 0.2 mw in real mode. GDC is tape out in HJTC 180 nm process with evaluation kit and demo system developed.
    No preview · Conference Paper · May 2009
  • Xiu-Ling Wang · Wu-Chen Wu · Shu-Qin Geng · Li-Gang Hou
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    ABSTRACT: The extinction coil of automatic tuning is important in reducing grounding current, depressing flash and grounding surge. Before bringing into the electric grid, the equipment must be tested for the safe and equilibrium operating. In the article, through the simulation experiment on the magnetic biasing extinction coil, verified the validity of high/low voltage regulating characteristic for the all-digital instrument, and analyzed the characteristics to judge this equipment whether can meet the requirements of grid system operation. The results showed that the extinction coil of automatic tuning can play a role when earth fault occurs and the actual regulating characteristic can meet the practical requirements.
    No preview · Article · Mar 2009
  • Li-gang Hou · Xiao-hong Peng · Wu-chen Wu
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    ABSTRACT: Pseudo random bit generator is widely used in BIST for test pattern generation. Typical pseudo random bit generator adopts linear feedback shift register (LFSR) as its basic circuit. Dynamic LFSR (DLFSR[1]) which has better cryptographic properties with respect to typical LFSR consumes more power. This paper forwards a low power DLFSR (LDLFSR) circuit which achieves comparable performance with less power consumption. Typical LFSR, a DFLSR[1], a LDLFSR are compared on randomness property and inviolability property. Multi-layer perceptron neural networks are used to test these LFSRs¿ inviolability property. Result shows that LDLFSR keeps comparable performance with a 7% power reduction and a 5.6% area reduction.
    No preview · Conference Paper · Nov 2008
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    ABSTRACT: Saving power and extending identification distance are important problems in portables. This paper presents a system on chip for radio frequency identification (RFID) active tag to extend the identification distance and battery life. It uses hardware and software to execute the checking, identifying and real time anti-collision. RF module and active tag system have been completed. Methods for low power consumption and a simple practical adjusting approach for RF module are introduced. The proposed system has advantages such as simple structure, low cost, and low energy electron diffraction. This system is successfully used in 433/868/915 MHz RFID. When TX power is adjusted by the software, the identification distance is between 80meters and 120meters.
    No preview · Conference Paper · Jan 2008