| Summary: | 碩士 === 國立高雄應用科技大學 === 電子工程系 === 100 === Recently, the System-on-a-Chip(SoC) are followed with more interests by researchers owing to the rapid development of integrated circuit manufacturing technology, such as measurement systems, sensor systems, consumer electronic products and so on. All of these applications will require the signal conversion. The conversion type of voltage to frequency is more common in the signal conversion between different interfaces. Therefore, the low-cost voltage to frequency converter(VFC) can be used in wide applications.
This thesis proposes a voltage to frequency converters with duty cycle modulation . The proposed VFC circuits can be operated with lower cost in comparison with the use of voltage windows comparator in conventional VFC circuits. Moreover, the ability of duty cycle modulation can be simply carried out by adjusting an external input voltage level. The errors caused by the conversion of voltage to frequency are also analyzed, and then the relationships between error and circuit are also discussed.
The use of the 0.18-um 1P6M technology was provided by Chip Implementation Center(CIC) to accomplish a duty cycle modulation of the voltage to frequency converter. This result has the advantages of low-cost, high sensitivity and the capacity of modulation duty cycles can be easily combined with other circuitry to extend it practical application, and all previous VFC circuits provide only a single frequency of oscillation in standard operation. The designed chip has been fabricated through CIC and the PCB testing board design, measurement chip to verify its functionality.
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