Input matching circuit for multiband low noise amplifier
US7253688B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 24, 2005 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | Jun 15, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/7209
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Provided is a multiband low noise amplifier including a first transistor, an input matching circuit, and a first capacitor. The first transistor includes a collector electrically connected to a first power supply, a grounded emitter, and a base connected to the other end of a first inductor having one end as an input end of the low noise amplifier. The input matching circuit is connected between the collector and the base of the first transistor. The first capacitor connected to the collector of the first transistior. The input matching circuit includes a varactor. The input matching circuit includes a second capacitor connected to the varactor. The input matching circuit includes a first resistor connected to the varactor. In the multiband low noise amplifier, a varactor having a variable capacitance is installed at an input end, thereby easily performing band switching through bias voltage control by a small amount and minimizing noises that may be caused by a control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.