A　balanced-broadband　low　noise　amplifier　(LNA)　was　designed　with　the　FR4　substrate,　using　packaged　SiGe　HBTs　BFP640　and　chip　type　passive　components.　The　design　principle　and　technology　features　of　the　structure　of　the　balanced　LNA　were　described.　The　computer　simulated　results　indicate　that　this　SiGe　balanced　LNA　has　the　advantages　of　the　noise　figure　less　than　0.9dB　over　0.8GHz　to　1.7　GHz　range,　the　high　gain　of　37dB,　the　input　and　output　reflected　coefficients　are　all　less　than　-50dB.