In this paper, we reviewed and presented our latest progress of linearization methods for microwave photonic systems based on programmable photonic circuits, including the linearization in microwave photonic transmission links and programmable functional circuits.
Low imbalanced and fully matched active baluns have been designed for 21GHz up-conversion Gilbert mixer’s ports. It consists of a common-gate FET and a common-source FET with input and output matching networks. The balun has been realized in 0.25μm GaAs pHEMT process. Simulation shows that the phase error of LO balun could be controlled within 2 degrees over the frequency of 3-6GHz, and the phase error of IF balun could be controlled within 3 degrees over the frequency of 16-18GHz.All ports are matched at the impendence of 50Ω for mixer use. The inhibition of the Gilbert mixer using proposed active baluns is more than 40dBc.
For the requirements of high efficiency of communications satellite on solid state power amplifier in the broadband. In this paper, a power amplifier works in 3.7-4.2GHz using gallium nitride (GaN) based high electron mobility transistor (HEMT) for satellite application was presented. The test results show that in the 3. 7-4. 2 GHz frequency range, under the conditions of the drain voltage of 28 V, the gate voltage of -2.8 V and continuous wave, the saturated output power and drain efficiency of the designed amplifier in this paper are above 40.02 dBm and 59.6% respectively.
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