A High Performance Downconverter MMIC for DBS Applications

概要

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In this work, using 0.2μm GaAs modulation doped FET(MODFET), a high performance downconverter MMIC was developed for direct broadcasting satellite(DBS)applications. The downconverter MMIC showed a noise figure of 4.3dB which is lower by 5dB than conventional ones, and required only a low LO power of -10dBm for normal DBS operation. At a low LO power of -10dBm, the power consumption was 175mW, which is lower than 50 percent of conventional ones. The frequency response of conversion gain exhibited a low gain ripple of 0.9dB, and the LO leakage power was suppressed to a lower value than -30dBm under a LO input power of -10dBm. The fabricated chip exhibited a small size of 0.84×0.9mm^2. The objectives of this work are to improve the traditional direct broadcasting satellite(DBS)downconverters by an efficient circuit design and to describe the techniques employed in the design.
社団法人電子情報通信学会の論文
2001-11-01