一种低功耗混合信号直流失调消除电路  

A Low Power Mixed-Signal DC Offset Calibration Circuit

作　　者：杨利君[1] 袁芳 石寅 陈治明[1] 

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

出　　处：《微电子学》2011年第5期649-653,共5页Microelectronics

摘　　要：设计了一种应用于直接变频接收机的低功耗混合信号直流失调消除(DCOC)电路。该电路采用混合信号的方式消除直流失调电压,避免了传统模拟域直流失调消除系统环路响应速度与高通带宽之间的折中,具有功耗低、建立时间快、面积小等优点。采用该DCOC后,直接变频接收机的输出剩余直流失调电压小于37mV,直流失调消除环路的建立时间小于200μs。电路采用0.13μm CMOS工艺实现,芯片尺寸为0.372mm×0.419mm,工作于1.2V电源电压时,消耗电流仅为196μA。A low power mixed-signal DC offset calibration（DCOC） circuit for direct conversion receiver was designed.With no need for trade-off between response time and high-pass bandwidth of the servo loop,as required by conventional analog DCOC systems,the proposed DCOC circuit features low-power consumption,fast settling time and small die area.Using the proposed DC offset correction circuit,output residue DC offset voltages of the direct conversion receiver could be reduced to less than 37 mV,and settling time of the DCOC loop was less than 200 μs.Fabricated in standard 0.13 μm CMOS technology,the DCOC circuit occupies a chip area of 0.372 mm × 0.419 mm,and it draws only 196 μA of current from 1.2 V supply power.

关 键 词：混合信号 直流失调校正 A/D转换器 D/A转换器 数字控制逻辑单元 

分 类 号：TN432[电子电信—微电子学与固体电子学]