An ultra-wideband (UWB) hybrid low noise amplifier (LNA) is presented. The topology is a two-stage amplifier including a bandpass Chebychev LC filter and a source-follower buffer. The bandpass filter works as input matching network to give an acceptable reflection coefficient and a small amount dc power.Gain flatness is achieved mainly by the two transistors with matching network between stages. And the slight source negative feedback inductors is designed to facilitate input impedance and noise matching. The proposed UWB amplifier is implemented with gallium arsenide (GaAs) field effect transistors and a Rogers substrate (RO4003). The LNA gives 18.2 dB gain flatting, a minimum noise figure (NF) of 1.2 dB, input and output reflection coefficient better than -12 dB within 2 dB from 3.1 to 10.6 GHz.
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