The invention relates to a frequency-selective LNA-type CMOS amplifier which amplifies the input signal in a broad band. According to the invention, the selective amplifier consists of an amplifier (1) implemented with a pair of parallel NMOS transistors (4 and 5) for providing two signal paths, polarized by means of a current mirror (2) made with two PMOS transistors (10 and 11), a passive network (3) with a notch-type frequency characteristic being connected to the inlet of the mirror (2), for signal filtering in a broad band.
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