Balun Signal Transformer Offset Resonance for Harmonic Suppression
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Solution Overview
Problem
Balun signal transformers face performance issues due to manufacturing process variations, particularly in second harmonic suppression, leading to yield loss and diminished circuit performance.
Innovation Solution
Incorporating two tuned circuits coupled to the balanced port of the balun signal transformer, which produce offset resonance, enhancing second harmonic suppression and increasing tolerance to process variations such as capacitor variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manufacturing process is simplified to increase productivity, then productivity improves, but manufacturing precision deteriorates leading to yield loss
Solution Approach 1:
The patent changes the design parameters by introducing two capacitors with different values (first capacitor and second capacitor) and two inductors with different values (first inductor and second inductor) to create offset resonance. This parameter differentiation allows the circuit to maintain second harmonic suppression performance even when individual component values vary due to manufacturing tolerances, thus resolving the contradiction between manufacturing precision and productivity
Solution Approach 2:
The patent employs asymmetric configuration where the first capacitor has a different value than the second capacitor, and the first inductor has a different value than the second inductor. This asymmetric design creates offset resonance that widens the suppression bandwidth for second harmonics, making the system more tolerant to manufacturing variations and enabling higher productivity without sacrificing performance
2Ease of manufacture
If tolerance for processing variation is increased to improve ease of manufacture, then ease of manufacture improves, but second harmonic suppression performance deteriorates
Solution Approach 1:
By introducing multiple capacitors and inductors with different parameter values, the patent creates a system where the overall second harmonic suppression performance is maintained even when individual components vary within manufacturing tolerances. The offset resonance mechanism ensures that performance degradation from component variation is compensated
Solution Approach 2:
The tuned circuits serve multiple functions: they provide second harmonic suppression, establish offset resonance, and simultaneously broaden the suppression bandwidth. This multi-functionality ensures that even with processing variations, the circuit maintains reliable second harmonic suppression while being easier to manufacture
3Reliability
If bandwidth for second harmonic suppression is widened to improve reliability, then reliability improves, but device complexity increases
Solution Approach 1:
The patent segments the second harmonic suppression function into two separate tuned circuits (first tuned circuit with first capacitor and first inductor, second tuned circuit with second capacitor and second inductor). Each tuned circuit operates at a different frequency due to the different component values, creating offset resonance that collectively provides wider bandwidth suppression. This segmentation achieves wider bandwidth without requiring a single complex wideband filter
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves circuit performance and yield by widening the bandwidth for second harmonic suppression, allowing for more robust manufacturing processes with higher variation tolerance.
Implementation Method 1
two tuned circuits coupled to the balanced port of the balun signal transformer, which produce offset resonance, enhancing second harmonic suppression
Data Source
AI summary
A balanced-unbalanced (balun) signal transformer includes an unbalanced port, a balanced port coupled to the unbalanced port, the balanced port comprising a first terminal and a second terminal, a first capacitor coupled to the first terminal, a first inductor coupled to ground and the first capacitor, a second capacitor coupled to the second terminal, and a second inductor coupled to ground and the second capacitor. The transformer may also include a third capacitor coupled to a terminal of the unbalanced port; and a third inductor coupled to the third capacitor and the third terminal.