MMIC混频器电路设计与非线性分析

采用清华大学自行编制的混频器非线性分析程序ＴＵＭＩＸＥＲ，设计并研制了Ｋａ频段ＭＭＩＣ平衡混频器。在对混频器电路的大信号非线性仿真过程中，进行了多频谐波平衡分析，给出了混频器电路在多频输入情况下的输出频谱，对电路中的各种分布参数元件及微带不连续性区域，采用场匹配法作了严格计算。所研制的Ｋａ频段单片集成混频器电路，制作在一块２ｍｍ×３ｍｍ的ＧａＡｓ芯片上，在３１～３６ＧＨｚ频段上，混频器的噪声系数小于１０ｄＢ。

MMIC Mixer Circuit Design and Nonlinear Analysis

In this paper,mixer nonlinear analysis software TUMIXER, programmed by Tsinghua University, is used to design and develop a KaWeband MMIC balanced mixer. In large signal nonlinear simulation of the mixer circuit,the multi-tone nonlinear harmonic balance analysis is carried out,and the output spectrum with multiple inputs is given. All kinds of distribution elements and microstrip discontinuity in the circuit are computed strictly by using mode-match method.The monolithic integrated mixer circuit is manufactured on a GaAs chip of 2 mm × 3 mm size. The SSB noise figure less than 10 dB at the band of 31～36 GHz is obtained.