公开(公告)号：US20220231648A1

公开(公告)日：2022-07-21

申请号：US17671374

申请日：2022-02-14

Applicant: pSemi Corporation

Inventor： Jing LI ,  Emre AYRANCI ,  Miles SANNER

IPC: H03G3/30 ,  H03F3/193 ,  H03F1/32 ,  H03F3/72 ,  H03G1/00 ,  H03G3/00 ,  H03F1/22 ,  H03F3/21

Abstract: A multi-gain LNA with inductive source degeneration is presented. The inductive source degeneration is provided via a tunable degeneration network that includes an inductor in parallel with one or more switchable shunting networks. Each shunting network includes a shunting capacitor that can selectively be coupled in parallel to the inductor. A capacitance of the shunting capacitor is calculated so that a combined impedance of the inductor and the shunting capacitor at a narrowband frequency of operation is effectively an inductance. The inductance is calculated according to a desired gain of the LNA. According to one aspect, the switchable shunting network includes a resistor in series connection with the shunting capacitor to provide broadband frequency response stability of the tunable degeneration network. According to another aspect, the LNA includes a plurality of selectable branches to further control gain of the LNA.