US Patent 9621202 Common gate multiple input low noise amplifier

Antenna diversity integrated circuit having two or more RF input connections for connecting an antenna (1a, 1b, 1c). A low noise amplifier circuit is present having a first stage (7a, 7b, 7c) for each one of the two or more RF input connections and a single second stage (8). Output connections of each of the first stages (7a, 7b, 7c) are combined in a single summing node to which an inductor (L) and an input connection of the second stage (8) are connected. During operation one of the two or more first stages (7a, 7b, 7c) is activated to provide an input signal to the second stage (8).