Tunable effective inductance for multi-gain LNA with inductive source degeneration

A method of operating a multi-gain low noise amplifier (LNA), the method comprising:

• selectively coupling a first capacitor of the multi-gain LNA and a resistor of the multi-gain LNA between a first terminal and a second terminal of an inductor of the multi-gain LNA, wherein the first capacitor is in series connection with the resistor of the multi-gain LNA, wherein a gain mode of the multi-gain LNA is based at least in part on the selectively coupling, wherein the first terminal of the inductor is coupled to a first transistor of one or more transistors of the multi-gain LNA, and wherein the second terminal of the inductor is coupled to a reference ground;
• and
• providing, by the one or more transistors, an output signal to an output port of the multi-gain LNA based on an input signal received at an input port of the multi-gain LNA and the selectively coupling, wherein a capacitance of the first capacitor is selected so that at a frequency band of operation of the multi-gain LNA, a parallel combination of the inductor and the first capacitor results in a first parallel combined inductive impedance that is larger than an inductive impedance of the inductor.