Predistortion circuit including distortion generator diodes with adjustable diode bias
US7925170B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 2007 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Jun 10, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/0425
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A predistortion circuit provides a predistorted input signal that compensates for distortion generated by a non-linear amplifier such as a laser device. The predistortion circuit may be used in an optical transmitter designed for broadband applications, such as a laser transmitter used for forward path CATV applications. The predistortion circuit may include a primary signal path and a secondary signal path that receive an input signal. A second order distortion generator on the secondary signal path generates predistortion of a magnitude corresponding to the magnitude of, but at an opposite phase to, the distortion generated by the non-linear amplifier. The second order distortion generator includes diodes with an adjustable diode bias to control phase, magnitude and/or magnitude/phase versus frequency of the predistortion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.