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Writing Engineering Abstracts(37)

http://www.chineseowl.idv.tw

http://www.chineseowl.idv.tw/http://www.chineseowl.idv.tw/

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(1 of 2) (+) Stepping motors areextensively adopted in electronic consumer products suchas DVDs, digital cameras and cellular phones owing totheir high-resolution position capability and miniaturizedsize. However, a controller with external driving devices

increases not only the complexity of PCB layout, but alsooverhead costs. Additionally, the conventionally adopteddriving method incurs an intolerable amount of vibrationand generates much noise while operating under the pulse-shaped driving signal. Therefore, this work describes

a novel control method with micro-stepping capabilities todrive stepping motors smoothly by effectively removing thevibration and noise originating from a non-uniform force ofmotors.

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(2 of 2)Mathematic models of stepping motor and drivingwaveform are analyzed. The level of quasi-sinusoidalwaveform is then easily calculated for a pre-given level ofnumbers. Next, a driving circuit with a quasi-sinusoidaloutput current is designed with a DAC and a current drive

circuit. Simulation results indicate thatthe proposed micro-stepping control method locatesprecisely and decreases vibration and noise originatingfrom pulsed-waveform driving by 10%.Importantly, the proposed method can locate and minimize

vibration and noise during motor operation more effectivelythan other commercially available ones can.

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(1 of 2) (+) Small-format TFT LCDsrequire an analog video decoder, while large-format TFTLCDs require a digital one. An analog video decoder canconvert composite video signals to RGB color signals fordelivery to panel data lines. Whereas small-format TFT

LCDs have two specific systems, NTSC and PAL,conventional analog video decoders can only decodeNTSC and PAL, thus minimizing system flexibility. Therefore, this work presents an analog video decoder thatcan automatically sense and switch between NTSC and

PAL systems. A circuit for a video composite videosignal decoder is developed, which contains a VCOMamplifier. Sensing and switching functions are thenincorporated for differentiating between specific systems,NTSC and PAL.

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(2 of 2)Next, a PLL circuit is added since the demand frequency ofPAL is 4.43 MHz. Additionally, various system circuits, e.g.,trap filters, select various frequencies for the signal process.Moreover, output stages are equipped with sufficientdriving capability to deliver RGB signals to panel data lines.

Simulation results indicate that theproposed analog video decoder can satisfy video functionsrequested and attain a high performance. Capable of reducing the cost of system peripheralcomponents, owing to its integration of NTSC and PAL

systems, the analog video decoder is the first chip in videoapplication in Taiwan owing to its ability to decode bothNTSC and PAL color signals. Moreover, the proposed chipcan enhance flexibility in system applications and enhanceuser convenience.

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Further details can be found at

http://www.chineseowl.idv.tw

http://www.chineseowl.idv.tw/http://www.chineseowl.idv.tw/