Adjustable Resonator Loop Tuning for Stable SAW/BAW Filtering
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Solution Overview
Problem
Resonant structures, particularly high Q resonators like SAW/BAW filters, face performance variations due to thermal effects and manufacturing processes, leading to reduced filtering effectiveness in communication circuits.
Innovation Solution
A resonant circuit with a signal loop comprising a primary resonator and an adjustable resonator, where the adjustable resonator's frequency and gain are controlled to modify the closed loop frequency response, allowing for enhanced performance of external resonators such as antennas and SAW/BAW filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SAW/BAW filters are used as resonators, then high Q filtering performance is achieved, but thermal variations and manufacturing effects cause performance degradation
Solution Approach 1:
The patent implements a feedback control system where the resonator's performance parameters are continuously monitored and adjusted. A controller receives feedback signals about the resonator's actual performance and modifies control signals to compensate for thermal variations and manufacturing deviations, thereby maintaining stable filtering effectiveness despite environmental changes
Solution Approach 2:
The patent dynamically adjusts resonator parameters such as frequency and impedance through controlled modification of resonator characteristics. By changing these parameters in response to detected performance deviations, the system compensates for thermal drift and manufacturing variations, maintaining optimal filtering performance across different operating conditions
2Ease of manufacture
If fixed performance resonators are used, then manufacturing is simpler, but performance cannot be adjusted for different applications
Solution Approach 1:
The patent transforms fixed resonators into dynamically adjustable components by introducing control mechanisms that allow real-time modification of resonator characteristics. The resonator's frequency, impedance, and other parameters can be dynamically changed through control signals, enabling the same manufactured component to adapt to different application requirements without requiring multiple fixed resonator types
3Reliability
If resonators are designed for specific frequency bands, then filtering performance is optimized, but the resonators cannot be reused for different frequency ranges
Solution Approach 1:
The patent enables frequency tuning by dynamically modifying resonator parameters such as capacitance, inductance, or physical dimensions through control signals. This allows a single resonator designed for a specific frequency band to be retuned to different frequency ranges by changing its electrical or physical parameters, maintaining optimal filtering performance across multiple frequency applications
Data Source
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).