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A direct-coupled low noise amplifier was designed and fabricated on a Teflon substrate, using packaged SiGe HBTs BFP420 and chip type passive components. This SiGe LNA has the advantages such as the wide bandwidth (2.5GHz), the low noise figure (NF &le 2.23dB), the high power gain (S21 ≥ 26.7dB), the input and output VSWR are all less than 2. The design principle and technology features of the broadband amplifier was described. The computer simulated results were coincident with that of the test. © 2005 IEEE.
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