CPC H03G 3/3036 (2013.01) [H03F 1/223 (2013.01); H03F 1/3205 (2013.01); H03F 3/193 (2013.01); H03F 3/211 (2013.01); H03F 3/72 (2013.01); H03G 1/0023 (2013.01); H03G 1/0029 (2013.01); H03G 1/0088 (2013.01); H03G 3/001 (2013.01); H03F 2200/156 (2013.01); H03F 2200/159 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01); H03F 2200/489 (2013.01); H03F 2200/492 (2013.01); H03F 2200/61 (2013.01); H03F 2203/7239 (2013.01); H03G 3/3052 (2013.01); H03G 2201/504 (2013.01)] | 24 Claims |
1. A multi-gain low noise amplifier (LNA), comprising:
a cascode arrangement comprising an input transistor and an output cascode transistor; and
a tunable degeneration network having a first terminal connected to a source of the input transistor and a second terminal connected to a reference ground, the tunable degeneration network comprising:
a fixed inductance inductor connected between the first terminal and the second terminal; and
a first switchable shunting network connected between the first terminal and the second terminal, the first switchable shunting network comprising:
a first switch in series connection with a first capacitor, wherein the first capacitor has a capacitance so that at a frequency band of operation of the multi-gain LNA, a parallel combination of the fixed inductance inductor and the first capacitor results in a first parallel combined inductive impedance that is larger than an inductive impedance of the fixed inductance inductor.
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