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In this work, using 0.2 ㎜ GaAs modulation doped FET (MODFET), a high performance DBS downconverter MMIC was developed for direct broadcasting satellite (DBS) applications. Without LNA, the downconverter MMIC showed a very low noise of 4.8 ㏈, which is lower by 3 ㏈ than conventional ones. A low LO power of -10 ㏈m was required for the normal DBS operation of the downconverter MMIC, which reduced the power consumption via a removal of LO amplifier on MMIC. It required only a low power consumption of 175 ㎽, which is lower than 70 percent of conventional ones. The LO leakage power at IF output was suppressed to a lower level than 30 ㏈m, which removes a bulky LO rejection filter on a board. The fabricated chip, which include a mixer, IF amplifiers, LO rejection filter, and active balun, exhibited a small size of 0.84×0.9 ㎟. |
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