直接变频接收机直流失调消除技术  

DC Offset Cancellation in Direct Conversion Receiver

作　　者：雷倩倩[1] 陈治明[1] 石寅 

机构地区：[1]西安理工大学,西安710048 [2]苏州中科半导体集成技术研发中心,江苏苏州215021

出　　处：《微电子学》2012年第3期347-351,共5页Microelectronics

摘　　要：基于传统的负反馈结构,提出一种改进的直流失调消除技术。分别采用密勒效应和线性区工作的MOS管,实现等效大电容和大电阻。采用此方法的失调消除技术易于实现片内集成。同时,使用补偿电路减小直流失调消除环路中高通截止频率随温度和工艺的变化。设计的电路高通截止频率为500Hz,芯片尺寸为740μm×780μm。A DC offset canceller in direct conversion receiver was proposed based on conventional negative feed- back structure. In this technique, Miller effect and MOS transistors operating in linear range were adopted to realize large value capacitor and resistor, thereby canceling DC; offset. Compensation circuit was also designed to reduce variation of high pass cutoff frequency （HPCF） with temperature and process. The proposed circuit, which occupied a chip area of 740μm-780μm, achieved a 500 Hz of HPCF.

关 键 词：直接变频接收机 直流失调 可变增益放大器 

分 类 号：TN492[电子电信—微电子学与固体电子学]