Hybrid Matrix Reference Oscillator for Impedance-Stable Redundancy
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Solution Overview
Problem
In satellite communication payload systems, the existing reference oscillator systems face significant challenges with input impedance changes, particularly due to redundancy structures, which can lead to frequency pulling issues when impedance mismatch occurs between the main device and redundancy.
Innovation Solution
A master reference oscillator system is designed using a hybrid matrix combining 90-degree and 180-degree hybrids, along with termination resistors, to minimize input impedance changes and improve frequency pulling performance by ensuring consistent signal magnitude and phase differences across output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundancy structure is implemented in the reference oscillator system, then system reliability is improved, but input impedance changes occur leading to frequency pulling issues
Solution Approach 1:
A hybrid matrix is introduced as an intermediary component between the reference oscillator and the plurality of local oscillators. This hybrid matrix includes specific phase shifters and power dividers that actively manage signal distribution, maintaining consistent input impedance presentation to the reference oscillator regardless of the redundancy switching state, thereby preventing frequency pulling while preserving reliability
2Adaptability or versatility
If multiple local oscillators are used in the frequency converter system, then system functionality is enhanced, but impedance mismatch occurs between main device and redundancy
Solution Approach 1:
The hybrid matrix implements local quality control by providing different phase shifts and signal paths to different local oscillators. Each branch of the hybrid matrix is specifically designed with appropriate phase shifters and power dividers to ensure that each local oscillator receives a properly conditioned signal, maintaining impedance matching across all branches despite the plurality of devices
Data Source
AI summary
A master reference oscillator system is provided. The master reference oscillator system includes a plurality of reference oscillators and a hybrid matrix receiving signals from the plurality of reference oscillators and outputting a plurality of output signals having the same signal magnitude, wherein at least two output signals among the plurality of output signals may have a phase difference.