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介绍了单平衡混频器和Lange耦合器的工作原理,基于0.15μm GaAs PHEMT工艺技术,设计了一款Ka波段单平衡宽带混频器芯片,仿真结果显示该混频器芯片在30~40 GHz频率范围内获得了良好的性能,变频损耗小于10 dB,射频-本振隔离度大于30 dB,中频-本振隔离度大于35 dB,中频-射频隔离度大于40 dB,同时具有优良的驻波特性,P-1 dB功率大于0 dBm。该芯片尺寸为1.7 mm×1.8 mm。对该混频器进行了流片,并进行测试,测试结果表明,该混频器变频损耗约为8 dB,各端口间隔离度均优于30 dB。测试结果和仿真结果一致性良好。采用Lange耦合器是该混频器的特点,使它获得了良好的性能指标和更宽的带宽。
The working principle of single balanced mixer and Lange coupler is introduced. Based on the 0.15μm GaAs PHEMT process technology, a Ka - band single balanced broadband mixer chip is designed. The simulation results show that the mixer chip operates at 30-40 GHz Good performance in the frequency range, less than 10 dB conversion loss, RF-LO isolation greater than 30 dB, IF-LO isolation greater than 35 dB, IF-RF isolation greater than 40 dB, excellent VSWR Characteristics, P-1 dB power is greater than 0 dBm. The chip size is 1.7 mm × 1.8 mm. The mixer was streamed and tested, the test results show that the frequency conversion loss of the mixer is about 8 dB, the isolation between ports are better than 30 dB. The test results are in good agreement with the simulation results. The use of a Lange coupler is a feature of the mixer that gives it good performance specifications and wider bandwidth.