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介绍了一种用于毫米波系统的下变频器,其中混频器采用了肖特基二极管镜频回收混频结构,振荡器采用了DRO(dielectric resonator oscillator)结构以提高系统性能,以保证在合适的体积内实现较高的频率稳定度.描述了系统中低噪声放大器、混频器、振荡器的性能,用于评估系统链路性能,最后合并制作在单个基片上.根据测试结果,该下变频器的噪声系数在35GHz处1GHz频率范围内小于5dB,单边带相位噪声系数在偏离载波200kHz处达到-70dBc/Hz.由于采用了介质谐振结构,本振的频率稳定度小于60×10-6/℃.
A down-converter for millimeter-wave system is introduced, in which the mixer adopts the Schottky diode mirror frequency recovery mixer structure, and the oscillator uses the DRO (dielectric resonator oscillator) structure to improve the system performance, In a suitable volume to achieve a higher frequency stability.Described in the system of low noise amplifier, mixer, oscillator performance, used to evaluate the system link performance, and finally merged on a single substrate.According to the test results, The noise figure of the downconverter is less than 5dB in the 1GHz frequency range at 35GHz and the single sideband phase noise figure reaches -70dBc / Hz at 200kHz offset from the carrier. Due to the dielectric resonant structure, the frequency stability of the local oscillator is less than 60 × 10 -6 / ° C.