Jing.-Heng Chen

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SPICE modeling of a complete stepper motor system is described. Using a voltage-controlled oscillator to track sine and cosine of rotor angle and using an electrical analog of the mechanical assembly, SPICE simulates interactions between electrical and mechanical subsystems. The simulations confirm the effectiveness of preloading against gear backlash and(More)
An alternative type of 3-port polarization-independent optical quasi-circulator by utilizing a pair of holographic spatial walk-off polarizers (HSWPs) is proposed. This device consists of a reflection prism, three polarization beamsplitter cubes, a pair of HSWPs, a Faraday rotator, and a half-wave plate. The operating principles, the characteristics, and(More)
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