Variable gain amplifying apparatus which can change a gain during an operation
US6326842A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 2000 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Nov 16, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A variable gain amplifying apparatus which can accurately set a predetermined gain for amplifying. The variable gain amplifying apparatus has a first amplifying circuit, a second amplifying circuit and a third amplifying circuit. The first amplifying circuit can control a first gain during an operation. The second amplifying circuit is coupled to an output of the first amplifying circuit, in which a gain is fixed during an operation. The third amplifying circuit coupled to an output of the second amplifying circuit, in which a gain can be controlled during an operation. The apparatus can avoid deterioration in a distortion characteristic, an increase in a total noise figure and an increase in a consumptive electric power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.