SELECTIVE CMOS AMPLIFIER OF LNA TYPE WITH AN IMPEDANCE ADAPTATION CELL FOR OBTAINING BAND-PASS CHARACTERISTICS

摘要

The invention relates to an LNA-type amplifier (low noise amplifier) implemented in CMOS technology with a band-pass type characteristic. According to the invention, the amplifier uses an adaptation cell for a band-pass filtration of the input signal and contains one input buffer stage implemented with two common source stages and one which implements the rejection of the desired band, namely the change of the signal phase by 180°, the two signals, i. e. the filtered and the non-filtered one, being summed in an output node, where the initially rejected band, band-pass filtered, is obtained.