无线电工程
無線電工程
무선전공정
RADIO ENGINEERING OF CHINA
2015年
3期
62-66
,共5页
混频器%高线性%输入三阶截点%隔离度
混頻器%高線性%輸入三階截點%隔離度
혼빈기%고선성%수입삼계절점%격리도
mixer%highly linear%input third order intercept point%isolation
高线性度混频器是大动态接收系统的关键器件，其线性度的提高有利于扩展接收系统动态范围。通过对二极管混频器的非线性分析，从理论上推导出增加二极管数量可以提高混频器线性度。基于理论分析结果，采用GaAs pHEMT工艺，设计了一款高线性度双平衡混频器，射频频率0?03～3 GHz，对应本振频率3?95～6?92 GHz，中频输出频率3?92 GHz，输入三阶截点大于25 dBm，本振到中频、本振到射频的隔离度均大于37 dB，单片面积1?5 mm×1?1 mm。
高線性度混頻器是大動態接收繫統的關鍵器件，其線性度的提高有利于擴展接收繫統動態範圍。通過對二極管混頻器的非線性分析，從理論上推導齣增加二極管數量可以提高混頻器線性度。基于理論分析結果，採用GaAs pHEMT工藝，設計瞭一款高線性度雙平衡混頻器，射頻頻率0?03～3 GHz，對應本振頻率3?95～6?92 GHz，中頻輸齣頻率3?92 GHz，輸入三階截點大于25 dBm，本振到中頻、本振到射頻的隔離度均大于37 dB，單片麵積1?5 mm×1?1 mm。
고선성도혼빈기시대동태접수계통적관건기건，기선성도적제고유리우확전접수계통동태범위。통과대이겁관혼빈기적비선성분석，종이론상추도출증가이겁관수량가이제고혼빈기선성도。기우이론분석결과，채용GaAs pHEMT공예，설계료일관고선성도쌍평형혼빈기，사빈빈솔0?03～3 GHz，대응본진빈솔3?95～6?92 GHz，중빈수출빈솔3?92 GHz，수입삼계절점대우25 dBm，본진도중빈、본진도사빈적격리도균대우37 dB，단편면적1?5 mm×1?1 mm。
Highly linear mixer is the key component of high dynamic receiving system. Improvement of linearity is in favour of extending the dynamic range of the system. A method of improving the linearity of mixers by increasing the amount of diodes is inferred theoretically by means of the nonlinear analysis of diode mixers.Based on the result of theoretical analysis,ahighly linear double balanced mixeris designed using a GaAs pHEMT process,operating in the frequency range from 0.03~3 GHz.The corresponding local oscillator frequency is 3.95~6. 92 GHz. The mixer can achieve an input third order intercept point greater than 25 dBm at a fixed intermediate frequency of 3.92 GHz,while LO to IF and LO to RF isolation are both larger than 37 dB.The chip size is 1.5 mm×1.1 mm.
