Receiver front-end sensitivity booster
US7477883B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 2004 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Aug 2, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3068
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for increasing the sensitivity of a chain of amplifiers that comprises the steps of amplifying a signal by means of a first amplifier with a gain factor A1=A1,m*ΔA1, where A1,m denotes a constant gain factor and A1 denotes a gain factor variation with 1≦A1,min≦A1≦A1,max, further amplifying the signal by means of a second amplifier with a controllable gain factor A2≦A2,max, where variations A1 of the gain of the first amplifier are compensated by reducing the gain A2 of the second amplifier, so that the difference between the chain gain factor AC=A1*A2 and a target chain gain factor AT≦AT,max becomes zero. To solve the object of the invention to provide a method for increasing the sensitivity of a chain of amplifiers that suffers from gain factor variations, it is proposed that that the signal at the output of the second amplifier is additionally fed into a divider that applies a fixed factor A3≦1 to its input, that variations A1 of the gain factor A1 of the first amplifier as well as the fixed factor A3 are at least partially compensated by the gain factor A2 of the second amplifier, so that the difference between the chain gain factor AC′=A1*A2*A3…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.