Transmitter for high frequency signals
US5973559A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1998 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | May 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/368
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The transmitter is built according to the LINC principle and has two parallel signal branches, each of which includes an amplifier (V1, V2) and a phase modulator (PM1, PM2). A dividing network (WE) is provided which divides the received signal (DI) between both signal branches and a combining device (KB) which adds the output signals (S11, S22) of both signal branches to form a sum signal (SS). In order to control the phase error in both signal branches the dividing network (WE) is designed so that the assignment of the received signal components (S1, S2) in both signal branches is periodically exchanged at a predetermined cycle frequency (fc). The amplitude modulation of the sum signal (SS) generated by the cyclic exchange of the input signal components (S1,S2) is detected and the phase depending on it in at least one of the signal branches is changed so that amplitude modulation is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.