Patent ID: 8373509

Claim:
A low noise amplifier (LNA), comprising: an input stage circuit to receive an RF signal and having a first node and a second node; a first amplifier including a first pair of complementary MOS transistors each coupled to the first node through a pair of capacitors, respectively, to convert a noise voltage at the first node into a first noise current at output nodes of the first amplifier; and a second amplifier including a second pair of MOS transistors having their gates coupled to the second node through a pair of capacitors, respectively, the second amplifier providing noise canceling by summing the first noise current with a second noise current generated by the second amplifier as a function of the noise voltage at the second node, where the source of the first MOS transistor of the first pair is directly connected to the positive supply and where the drain of the first MOS transistor of the first pair is directly connected to the source of the first MOS transistor of the second pair.