Feedforward amplifier
US5898339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1997 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Aug 18, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3235
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A feedforward amplifier having a distortion detection loop and a distortion elimination loop is provided that achieves increased accuracy, improved response, and stable operation. A variable attenuator is placed in front of a detector in a loop output stage, and the amount of attenuation in the variable attenuator is set large during a transient response period during the rising of the amplifier, and set small during a steady-state condition. The detection of the transition to the steady-state condition is accomplished, for example, by comparing the detector output with a prescribed threshold value. The width of perturbation is set large during a transient response period, and set small during a steady-state condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.