Continuous variable-gain low-noise amplifier
US7164318B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2004 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Aug 26, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/372
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shunt feedback network connected from an intermediate node of the loading network to the input provides negative feedback that linearizes the amplifier as its gain is decreased. The circuit degrades the noise figure at lower gains by varying the gain without directly dumping the signal current to the power supply. The circuit produces only small changes in input and output impedances and preserves an improved reverse-isolation cascode characteristic as the gain is controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.