應用於液晶驅動器且具軌對軌B類插值放大器的高線性度十位元數位類比轉換器

Abstract

數位轉類比轉換器(DAC)在許多現代電子系統中扮演著關鍵角色，特別是在數據轉換、信號處理和各類精密控制應用中。本研究旨在設計和實現一種高解析度、低功耗的10位元DAC，以滿足各種對精度和功耗有嚴格要求的應用需求，如音頻處理、傳感器訊號處理、通訊系統、有機發光二極體(OLED) 和液晶顯示器(LCD)。本研究首先探討了傳統DAC架構的優劣，並提提出了一種改進的雙階段架構設計，以提高轉換精度和效率。該設計透過粗調電阻串數位類比轉換器架構及電壓插補技術，實現了對輸出電壓範圍的精確控制，旨在降低DAC的積分非線性誤差(INL)和微分非線性誤差(DNL)。最後使用TSMC 0.18μm Mixed Signal 1P6M製程實現10位元DAC之設計，量測結果顯示其在僅118μW功耗下仍能保持優異的線性度和單調性，展現出其在廣泛電子應用中的潛力。

The digital to analog converter (DAC) is pivotal in numerous modern electronic systems, particularly in data conversion, signal processing, and precision control applications. This study aims to design and implement a high-resolution, low-power 10-bit DAC to meet the stringent accuracy and power consumption requirements of applications such as audio processing, sensor signal conditioning, communication systems, organic light-emitting diodes (OLED), and liquid crystal displays (LCD). The research first evaluates the strengths and limitations of traditional DAC architectures and proposes an enhanced two-stage design to improve conversion accuracy and efficiency. The proposed design leverages a coarse resistor string DAC architecture and voltage interpolation techniques to control the output voltage range precisely, targeting the reduction of integral non-linearity (INL) and differential non-linearity (DNL) in the DAC. The 10-bit DAC was implemented using the TSMC 0.18μm mixed signal 1P6M process, with measurement results demonstrating that the design maintains excellent linearity and monotonicity with a power consumption of just 118 μW, highlighting its potential for a broad range of electronic applications.