PAGE CONTENTS
Objectives
1. Consolidation of system-level and component-level specifications,
2. Development and verification of the SSPA prototype,
3. Development and verification of the linearizer,
4. Development and verification of passive cooling,
5. Achieve small size, weight, power and price
Challenges
High efficiency together with stringent linearity requirements.
Support of multi-carrier transmission.
Challenging working environment.
System Architecture
System architecture consists of two key elements: 1) the SSPA which also includes driver and predriver stages and 2) the linearizer. In addition to that the system comprises of multiple supporting elements such as data converters, frequency up-conversion and down-conversion stages, attenuator etc.
Plan
Project is divided into two contractual phases. Aim of the phase 1 is to develop an SSPA breadboard incorporating heat sink, linearizer and a simple final HPA stage. Phase 2 focuses on the development of a new advanced concept HPA stage.
Main project milestones:
- Preliminary Design Review
- Fast Prototype Test Review
- Critical Design Review
- Test Readiness Review
Final Review
Current Status
Project has been completed. A prototype Doherty power amplifier with DPD linearisation delivering 15W (average) / 65 W (peak) power with DPD linearisation is demonstrated. The demonstrator meets all linearity, distortion and spectral regrowth requirements with significant margin while maintaining ~50% power-added efficiency across the frequency band of interest.
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