适用于IEEE 802.11a标准的10位100MS/s数模转换器(DAC)

caroline11

This thesis describes a 10-bit 100MS/s digital to analog converter (DAC) for IEEE 802.11a. For high-speed application, The current-source mode has been popular in high speed digital to analog converter applications. However, to obtain accurate current-source is not easy due to process variation. Although several calibration circuits are proposed to improve the accuracy, the cost and circuit complexity are usually very large. In this thesis, based on traditional threshold-voltage compensation method, we use a new current source biasing technique to reduce the current error caused by inevitable threshold-voltage variation, transistor (w/l) size variation, power-source variation and temperature change. Finally we apply this technique to 10-bit weighted-current-source digital to analog converter. SPICE simulations show that for 0.35-μm TSMC Mixed Signal 2P4M process with a 3.3 V power supply; the digital to analog convertervariation is reduced significantly.

本文介绍了一种适用于IEEE 802.11a标准的10位100MS/s数模转换器(DAC)。在高速应用中，电流源模式在高速数模转换应用中得到了广泛的应用。然而，由于工艺的变化，获取准确的电流源并不容易。为了提高精度，提出了多种校准电路，但成本和电路复杂度都很大。本文在传统阈值电压补偿方法的基础上，采用了一种新的电流源偏置技术，减小了阈值电压变化、晶体管(w/l)尺寸变化、电源变化和温度变化带来的电流误差。最后将该技术应用于10位加权电流源数模转换器。SPICE仿真结果表明，对于0.35-μm TSMC混合信号2P4M工艺，3.3 V电源;数字到模拟转换器的变化显著减少。