The Research Of Millimeter-wave Frequency Source Based On Frequency Multipliers

With fast development of Millimeter-Wave technology and the upgrade of electronic systems, there is a stricter requirement on the Millimeter-Wave frequency sources. One of the main methods of designing these sources is frequency multiplication. It not only can lower down the oscillation frequency of the systems, but also keep the merits of Microwave band frequency sources, such as high frequency stability and low phase noise. In this thesis, a 104 GHz frequency source was realized using Microwave PLL and multiplier chain.The phase noise performance of multiplier chain based source largely depends on the fundamental signal source, and this is one of the difficulties of this thesis. Firstly, the basic structure, transfer function and noise models of the PLL were studied. Based on this technology, we design a 13 GHz fundamental singal source with low phase noise, low spur. According to the measured data, the phase noise of 13 GHz PLL is-109.89dBc/Hz@10kHz, and its spurious suppression is better than-60 dBc in 3GHz band.The output power of the multiplier chain based source depends on the effiency of the final stage doubler. Accurate diode model and the use of varactors in the design are the keys to increase the efficiency of the doubler. In this thesis, we extract the MA46H146 varactor’s key physical parameters through C-V curve fitting, and build 3-D physical model in the electromagnetic simulation software HFSS according to the physical size of the device and the classic formula. Then, design the F-band single-diode frequency doubler combining HFSS with ADS. Measurements show that the peak efficiency of 15% occurred at an output frequency of 103 GHz with input power of 8mW when the doubler is baised at-5V. To our knowledge, this is the highest efficiency of the single diode doudler that is reported at this frequency in our country. Moreover, the test curve fits the simulated one very well.Finally, the system measurements are carried out. Measurements results show that: the output power of 104 GHz frequency source reached 8.6mW, Phase Noise is-90.55dBc/Hz@10kHz, and its spurious suppression is better than-60 dBc within 3GHz bandwidth.