| Summary: | 碩士 === 國立暨南國際大學 === 電機工程學系 === 98 === Two converters are proposed in this thesis. The first one is a 6-bit flash analog-to-digital converter (ADC), and the second one is a 10-bit voltage-type digital-to-analog converter (DAC) for Thin Film Transistor Liquid Crystal Display (TFT-LCD) source driver.
The 6-bit flash ADC is designed in TSMC 0.18μm process technology. The sampling rate is 2GSapmle/s, and the supply voltage is 1.8 Volt. In this work, the “fully differential” structure is adopted and each sub-circuit is well-designed (sophisticated designed) to get more benefit of the overall performance, including a track-and-hold circuit with better linearity, preamplifiers with the reset switches, and the comparator with diode-connected transistors added at the output to limit the output swing.
The second circuit, a 10-bit DAC, is designed in TSMC 0.35μm process technology. A new voltage-segmented DAC which combines a 4-bit DAC embedded operational amplifier is proposed. Two adjacent voltage levels, VH and VL, are selected from two 6-bit tree decoders, and then the 4-bit DAC embedded operational amplifier divides this voltage range into 16 segments. As a result, the 10-bits resolution can be achieved by this architecture. The source driver of LCD displayers implemented with the proposed 10-bit DAC shrinks the layout by more than 50% and greatly reduces costs.
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