Variable Phase Amplifier Feedback for Bidirectional Resonator Tuning
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Solution Overview
Problem
Conventional tuning methods for electromechanical oscillators with mechanical resonators are limited in accuracy due to manufacturing tolerances and environmental variations, allowing tuning only on one side of the series resonance frequency, which restricts the flexibility and precision of frequency adjustment.
Innovation Solution
A variable phase amplifier circuit that adjusts the phase of the differential signal pair fed back to the mechanical resonator, enabling tuning of the oscillating frequency on both sides of the series resonance peak by varying the phase shift introduced into the signal, thereby compensating for deviations in the inherent resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional tuning methods are used, then the oscillator can be tuned within a limited range, but the tuning accuracy is restricted and only one side of the series resonance frequency can be accessed
Solution Approach 1:
The patent applies dynamics by making the phase shift amount variable rather than fixed. The phase shifter circuit can dynamically adjust the phase shift amount based on the desired operating frequency, allowing the oscillator to be tuned across both sides of the series resonance frequency. This dynamic adjustment capability resolves the contradiction by enabling both wide tuning range and precise frequency selection.
Solution Approach 2:
The patent changes the phase shift parameter introduced by the phase shifter circuit to control the oscillation frequency. By varying the phase shift amount, the oscillator can be tuned to different frequencies on both sides of the series resonance frequency. This parameter change approach allows precise frequency control while maintaining a wide tuning range, resolving the accuracy-range contradiction.
2Manufacturing precision
If the mechanical resonator is designed with specific factors to achieve desired resonance frequency, then the design can be optimized, but manufacturing tolerances cause deviations from intended values
Solution Approach 1:
The patent uses feedback by continuously monitoring the oscillation frequency and adjusting the phase shift amount accordingly. The phase shifter circuit receives control signals that adjust the phase shift to maintain the desired oscillation frequency despite variations in the mechanical resonator's inherent resonance frequency caused by manufacturing tolerances or environmental changes. This feedback mechanism ensures both manufacturing precision and operational reliability.
Solution Approach 2:
The patent compensates for manufacturing tolerances by dynamically changing the phase shift parameter. When the inherent resonance frequency of the mechanical resonator deviates from the intended value due to manufacturing variations, the phase shifter adjusts the phase shift amount to compensate, maintaining the desired oscillation frequency. This parameter adjustment ensures both accurate manufacturing results and stable operational performance.
3Adaptability or versatility
If phase shifting circuitry is added to enable tuning on both sides of resonance, then tuning flexibility improves, but device complexity increases
Solution Approach 1:
The patent introduces a phase shifter circuit as an intermediary component between the mechanical resonator and the amplification circuit. This phase shifter acts as a mediator that adjusts the phase of the feedback signal, enabling flexible tuning across both sides of the series resonance frequency. The intermediary phase shifter adds minimal complexity while significantly improving tuning flexibility, as it can be implemented using simple RC networks or digital phase shifters.
Data Source
AI summary
A variable phase amplifier circuit is disclosed and its method of use in tuning devices having resonators. The variable phase amplifier receives an input differential signal pair. The input differential signal pair can be generated by a resonator device. The variable phase amplifier generates a modified differential signal pair in response to receiving the input differential signal pair. The variable phase amplifier provides a means to vary the phase of the modified differential signal pair with respect to the input differential signal pair, in an accurate and stable manner. If the modified differential signal pair with a phase shift introduced in it is fed back to the resonator device, the resonator will change its frequency of oscillation, where the new frequency of oscillation is a function of the phase of the modified differential signal pair.