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In this paper, a 3-5 GHz broadband flat gain low-noise amplifier (LNA) for ultra-wide band (UWB) receivers is presented. In this circuit, a cascode and cascade topology with modified input matching are designed in the frequency range of 3- 5 GHz. Choosing a common-gate technique presents greater flatness in broadband gain in the wide band frequency at the less than -3 dB input reflection coefficient. This approach allowed obtaining a flat broadband gain of 16.7±0.15 dB with an input reflection coefficient less than -5 dB, an output reflection coefficient less than -6 dB, and a noise figure less than 4.3 dB. It uses only 0.9 V voltage supply at 0.18 μm technology and consumes 13 mW (excluding buffer).