MIC linearizer for satellite communications
Abstract
MIC implementation of a predistortion-type nonlinearity compensating circuit or linearizer (LRZ) using FETAs in a distortion generator was studied and a compact, lightweight MIC-LRZ using tip devices was developed. The LRZ circuit has a symmetric construction which enables it to have a wideband characteristic, and its nonlinearities can be adjusted electrically. The LRZ can compensate nonlinearity up to saturation of the traveling wave tube amplifier (TWTA) and can provide large performance improvement using a TWTA with backoff operation. The TWTA with the soft-limiter LRZ (SL-LRZ) exhibits soft-limiter transfer characteristics in which the input-output amplitude response is linear up to saturation and phase nonlinearity is negligible. The MIC-LRZ and SL-LRZ are compact, lightweight, and effective for use with earth stations HPAs and satellite TWTAs.
- Publication:
-
Electronics Communications of Japan
- Pub Date:
- May 1985
- Bibcode:
- 1985JElCo..68...57S
- Keywords:
-
- Amplifier Design;
- Linear Amplifiers;
- Microwave Transmission;
- Satellite Transmission;
- Transmission Circuits;
- Traveling Wave Amplifiers;
- Intermodulation;
- Limiter Amplifiers;
- Linear Integrated Circuits;
- Phase Shift Circuits;
- Phase Shift Keying;
- Transistor Amplifiers;
- Transmission Efficiency;
- Communications and Radar