Amplifier circuit with amplitude and phase correction and method of operation
US6150881A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1999 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | May 25, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45702
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A correction circuit (10) includes a transistor (30) that generates a feedback signal for equalizing the amplitude and adjusting the phase of the output signals (V.sub.OUT- and V.sub.OUT+) that are provided at the output of the variable gain amplifier (10). The base terminal of the transistor (30) receives a summed value of the output signals (V.sub.OUT- and V.sub.OUT+). The summed value is inverted and fed back to the differential transistors (12 and 14) and combined with the output signals (V.sub.OUT- and V.sub.OUT+). The output signals (V.sub.OUT- and V.sub.OUT+) have a proper amplitude and phase relationship when the summed value is substantially zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.