一种1.8V 0.8～2.1GHz直接变频CMOS正交下变频器  

A 1.8 V 0.8-2.1 GHz CMOS Direct-Conversion Quadrature Demodulator

作　　者：胡骁[1] 蒋颖丹[1] 徐倩龙[1] 石春琦[1] 赖宗声[1,2] 张润曦[1] 

机构地区：[1]华东师范大学微电子电路与系统研究所,上海200062 [2]华东师范大学纳光电集成与先进装备教育部工程研究中心,上海200062

出　　处：《微电子学》2011年第6期803-809,共7页Microelectronics

基　　金：国家科技重大专项资助项目(2009ZX01034-002-002-001-02);上海市科委项目(08700741300;09700713800);上海重点学科建设项目(B411)

摘　　要：提出了一种CMOS宽带正交直接变频下变频器,片上集成了正交本振相位发生器。混频器采用三段式结构,包括跨导级、开关级和跨阻级作为输出级。跨导级采用互补型结构,在相同的功耗下获得更大的跨导。混频器核心电路未采用电感,能实现在宽频率范围内工作。芯片采用0.18μm CMOS工艺实现,整个变频器在1.8V电源电压下抽取29mA电流。仿真结果显示,在0.8～2.1GHz的频率范围内,下变频器在2MHz的中频带宽上实现了13dB的电压转换增益。双边带噪声系数为13.5dB,1/f转折频率小于300kHz。下变频器在1MHz中频处的IIP3值达7dBm。An integrated CMOS broadband direct-conversion quadrature demodulator with on-chip LO quadrature phase generator was presented.A three-segment structure consisting of transconductance stage,passive current-switch stage and trans-impedance output stage was adopted for mixer,and a complementary input architecture was used to increase transconductance for a given bias current.The core circuit of the mixer,which was inductorless,could operate over a broad range of frequencies.Fabricated in 0.18 μm CMOS technology,the chip drew 29 mA of current from a single 1.8 V supply.Simulation results showed that,in the frequency range from 0.8 GHz to 2.1 GHz,the demodulator achieved a conversion voltage gain of 13 dB with 2 MHz IF bandwidth,a double-sideband NF of 13.5 dB with 300 kHz 1/f noise corner,and an IIP3 of 7 dBm at 1 MHz intermediate frequency.

关 键 词：CMOS射频 直接变频接收机 无源电流开关混频器 正交下变频器 

分 类 号：TN432[电子电信—微电子学与固体电子学]