导　　师： 唐长文

学科专业： 080903

授予学位： 硕士

作　　者： ;

机构地区： 复旦大学

摘　　要： 射频接收机是包含射频、模拟和数字三种类型电路的片上系统。不同类型的电路对基准源性能要求各不相同,射频电路要求基准源提供低噪声的基准电压和电流。随着片上系统的规模不断增大,电源电压的波动对系统性能影响逐渐增大。针对这些问题,本文对基准源和温度检测电路进行了探索和研究,并且完成了—款数字电视调谐芯片基准源和温度检测电路的设计。 首先,设计了带隙基准电压源。针对射频接收机的要求,对带隙基准电路的温度系数、输出噪声和电源抑制及相互之间的关系进行了详细的分析。在此基础上,给出了具有高电源抑制和低输出噪声的电路设计方案。该电路设计的温度系数小于15.48ppm//℃, VDD为2.1-3.3V时直流电源抑制小于-79.8dB,VDD为1.8V时直流的电源抑制为-60dB,从100Hz到100kHz频率范围的积分噪声小于16.93μVrms。 其次,设计了电压—电流转换电路。电路采用6位数字信号控制片内电阻阵列,输出电流精度为7.8‰。通过增加共栅管,得到较高的电源抑制,其直流电源抑制为-95.3dB。 最后,设计了温度检测电路。电路的温度检测范围为-45℃～125℃,输出电压对温度的斜率为5.2mV//℃。 In this work, the reference source and temperature detection circuit are designed for DTV Tuner. The RF receiver is SoC/(System on Chip/),which includes three types of circuit system:RF, analog and digital circuits. The requirement of different type circuits to the reference varies, power fluctuations impact larger on the system. As result of the introduction of the RF circuit, need to lower output noise. Reference and temperature detection circuit design and exploration for these new problems. First, the article describes the design of bandgap voltage reference. To receiver characteristics, a detailed analysis of temperature coefficient, output noise and power supply rejection of bandgap, sort out a solution to meet the design requirements, with a high power supply rejection and low output noise characteristics, the temperature coefficient is less than15.48ppm//℃, the VDD of2.1～3.3V DC power supply rejection smaller than-79.8dB, the VDD of1.8V DC power supply rejection is-60dB.Less than16.93μVrms integral noise from100Hz to100kHz range. Then, the design of the voltage to current converter. The circuit uses6bits digital signal control on-chip resistor array, the output current accuracy of7.8/%o. Add the common-source common-gate transistors, get a high power supply rejection, in a simple circuit structure and its DC power supply rejection is-95.3dB. Finally, the design of temperature sensing circuitry. The temperature sensing range is-45℃-125℃, the temperature slope of the output voltage5.2mV//℃.

关 键 词： 带隙基准电压源 电压电流转换电路 温度检测电路 电源抑制 噪声 软修正 片内可调电阻

领　　域： [电子电信]