RF low noise amplifier

Abstract

In a communication transceiver receiving a signal from a signal source defined by a source impedance between first and second nodes, an amplifier is provided having an input impedance matched to the source impedance. The amplifier includes a first transconductance cell having a first transconductance related to the input impedance and including first and second transistors each having control, supply and output elements. The first transconductance cell receives the signal from the signal source at the first and second control elements and develops a modified version of the signal as an output current signal at the first and second output elements, respectively. The first and second transistors are interconnected such that the control element of the first transistor is connected to the output element of the second transistor, and the control element of the second transistor is connected to the output element of the first transistor. The amplifier further includes a second transconductance cell having a second transconductance related to the input impedance and including third and fourth transistors connected to the first and second output elements. The second transconductance cell combines currents appearing at the first and second output elements and develops a combined output current signal at respective output terminals thereof.

Dependencies are inferred from the claim text.