Resonator Loop Control for Stable SAW/BAW Filter Response
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Solution Overview
Problem
Resonant structures, particularly high Q resonators like SAW/BAW filters, face performance variations due to manufacturing processes and temperature changes, leading to reduced filtering effectiveness in communication circuits.
Innovation Solution
The integration of a primary resonator with a low Q variable resonator in a signal loop allows for active coupling, enabling control of the s-plane poles and performance metrics of the external resonator, such as antennas or SAW/BAW filters, through adjustment of the low Q resonator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SAW/BAW resonators are used for high Q filtering, then filtering performance is improved, but performance varies due to manufacturing processes and temperature changes
Solution Approach 1:
The patent implements a feedback control loop that continuously monitors the resonant frequency of the primary resonator and adjusts the resonant frequency of a secondary resonator to compensate for drift. The control circuit detects frequency deviations caused by temperature changes or manufacturing variations and applies corrective adjustments, thereby stabilizing the overall filtering performance despite environmental conditions.
Solution Approach 2:
The patent changes the resonant frequency parameter of the secondary resonator dynamically through control signals. By adjusting the resonant frequency of the secondary resonator in response to detected variations in the primary resonator, the system compensates for performance degradation and maintains stable filtering characteristics across different temperatures and manufacturing conditions.
2Ease of manufacture
If fixed performance resonators are used, then manufacturing is simpler, but adaptability to different conditions is reduced
Solution Approach 1:
The patent creates a universal resonator system where the secondary resonator can be adjusted to compensate for variations in the primary resonator. This multi-functional approach allows the same hardware configuration to adapt to different manufacturing variations and environmental conditions without requiring custom-designed resonators for each condition, thus maintaining ease of manufacture while gaining adaptability.
Data Source
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AI summary
A method and apparatus for modifying or controlling a resonator connected to a signal loop having an input (18828), an output (18822), and a closed loop frequency response. The signal loop has a primary resonator (18810) having a primary frequency response. There is at least one adjustable resonator (18812) having an adjustable frequency (f) and a secondary Q-factor. An adjustable scaling block (18824) applies a gain factor (g). A controller is connected to the at least one adjustable resonator (18812) and the adjustable scaling block (18824). The controller has instructions to adjust the closed loop frequency response toward a desired closed loop frequency response by controlling the adjustable frequency (f) of the at least one adjustable resonator (18812) and the gain factor (g) of the adjustable scaling block (18824).