| Summary: | 碩士 === 國立交通大學 === 電信工程系所 === 98 === In many signal processing applications, the data converter is a critical building block limiting the accuracy and speed of the overall system. Data converters have two type, Analog-to-digital converter (ADC) and digital-to-analog converter (DAC). In the analog-to-digital converter, sigma-delta analog-to-digital converter is traditionally used in instrumentation, voice, and audio applications that are low signal bandwidth and high resolution. Digital-to-analog converters are applied to the column driver circuit to drive the LCD pannal
In this thesis, the design flow of the continuous-time (CT) modulator is presented and a 100MHz CT single-bit active-RC sigma-delta modulator with 1MHz signal bandwidth for Bluetooth application is implemented. The design has been fabricated by TSMC 0.18μm CMOS process. The measured SNDR is 53.8dB and the dynamic range is about 56dB. The power consumption is about 10.2mW at 1.8V supply.
Furthermore, a DAC circuit for LCD column driver application is also implemented. Historically, column drivers have employed the resistor string DAC to provide the analog voltage, but it has to overcome solve problems. There we have developed a complete new system using a linear DAC in the column driver. The DAC circuit has been design by TSMC 0.35μm process.
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