Gain linearization with coplanar waveguide
US5291148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Dec 22, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/198
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A predistortion linearizer (20) is operative with a microwave signal, as may be provided by signal source (62) to linearize the gain of a power amplifier, such as a traveling-wave-tube power amplifier (74), by introduction of an amplitude and/or a phase distortion to the microwave signal wherein the distortion is inverse to a distortion introduced by the power amplifier, thereby to compensate for the distortion of the power amplifier. The linearizer is constructed of two channels (22, 24) which are operated in parallel but approximately 180 degrees out of phase, with an additional phase increment provided by delay lines (46, 56) to offset one channel from the other channel by a phase difference in a range of approximately 160-200 degrees. Included within each channel is a diode circuit (40, 50) wherein the diode circuit (40) includes a set of PIN diodes operated in linear fashion in the channel (22), and the diode circuit (50) includes a set of Schottky diodes operated in nonlinear fashion in the channel (24). The limiter diode circuit (50) limits signal amplitude resulting in a gain expansion and a phase advance upon summation of signal vectors of the two channels to provide an ou…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.