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A 4.6–5.6 GHz constant KVCO LC-VCO applied in PLL frequency synthesizer is presented in this paper. With constant KVCO LC-VCO and programmable charge pump, the frequency synthesizer is able to obtain constant bandwidth. Furthermore, the VCO has a low KVCO which will result low phase noise. An Optimized automatic frequency calibrator (AFC) is proposed, the AFC can select the sub-band which is nearest...
An electric controlled ignition system was developed for CNG engine, which was successfully applied in the bench test. The charge time of primary circuit is one of the most important parameters for the ignition system, which control the secondary voltage and current signal of the ignition coil, has a significant influences on the spark energy. Though a measurement system was developed to study the...
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