Patent ID: 7242253

Claim:
A low noise amplifier comprising a cascade device, said cascade device comprising: at least a first and a second transistor having a terminal in common and the output terminal of the second transistor being the output terminal of the cascode device and being coupled to the output terminal of the amplifier, a first circuit being positioned between a supply voltage and another terminal of said second transistor, wherein said first circuit comprises a series of two diodes positioned between said another terminal of the second transistor and ground and a further resistance positioned between said another terminal of the second transistor and the supply voltage, and a second circuit coupled to the output terminal of the cascode device, wherein said amplifier is operative at a given frequency, said first circuit comprises a first series of a resistance and a capacitance and said second circuit comprises a second series of a resistance and a capacitance, said first series being coupled between said another terminal of the second transistor and ground and said second series being coupled between the output terminal of the cascode device and ground, the values of said resistances of the first and of the second series being substantially lower than the module values of the respective capacitive impedances of said first and of said second series at said given frequency.