Tunable effective inductance for multi-gain LNA with inductive source degeneration
US11881828B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2022 |
| Grant date | Jan 23, 2024 |
| Priority date | — |
| Expiry date | Feb 20, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G2201/504
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.