Mechanical Resonator Oscillator Phase Sensing for Temperature Compensation
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Solution Overview
Problem
Mechanical resonators in oscillators face challenges with temperature stability due to temperature-dependent material properties, requiring additional temperature sensors that increase cost and introduce errors, while also separating physically from the resonator.
Innovation Solution
A mechanical resonator-based oscillator that amplitude modulates a harmonic pilot tone onto the input signal, measures the phase change of the output relative to the input, and uses this phase change as a temperature sensor to compensate for temperature-dependent frequency errors, eliminating the need for a separate temperature sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a temperature sensor is added to compensate for frequency errors, then temperature stability is improved, but cost increases and measurement precision deteriorates due to physical separation errors
Solution Approach 1:
The patent merges the temperature sensing function with the mechanical resonator itself by using the resonator's phase response to temperature as the sensing mechanism. The phase of the resonator's output signal naturally varies with temperature, eliminating the need for a separate temperature sensor and avoiding the physical separation errors that would compromise measurement precision.
Solution Approach 2:
The mechanical resonator performs multiple functions: it generates the oscillation signal and simultaneously provides temperature sensing through its phase response. This multi-functionality eliminates the need for dedicated temperature sensing components, reducing cost while maintaining measurement accuracy since the resonator itself experiences the temperature changes it measures.
2Stability of the object's composition
If a temperature sensor is added to compensate for frequency errors, then temperature stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the temperature compensation function into the existing resonator circuitry by utilizing the phase information already present in the resonator's output signal. This integration approach avoids adding separate temperature sensing components and simplifies the overall device architecture while achieving temperature stability.
Solution Approach 2:
The mechanical resonator serves itself by providing its own temperature sensing capability through its inherent phase response to temperature changes. The resonator's physical properties cause its phase to vary with temperature, and this natural response is directly utilized for compensation without requiring external sensing mechanisms.
3Measurement precision
If mechanical resonators are used to achieve low jitter and phase noise, then oscillation precision is improved, but temperature stability deteriorates due to temperature-sensitive material properties
Solution Approach 1:
The patent implements feedback by continuously monitoring the phase of the resonator's output signal and using this information to adjust the oscillation frequency. The phase changes caused by temperature variations are detected and fed back to the frequency control mechanism, which compensates for the frequency drift, thereby maintaining temperature stability while preserving the low jitter and phase noise characteristics.
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 provides accurate temperature compensation with reduced costs and errors, as the resonator itself acts as a temperature sensor, ensuring robust temperature stability and simplified design.
Implementation Method 1
a mechanical resonator comprising a body configured to vibrate according to the input signal and to output a vibration signal
Implementation Method 2
a phase detector configured to detect a relative phase of the vibration signal with respect to the input signal
Data Source
AI summary
A mechanical resonator-based oscillator comprises an input signal generator configured to output an input signal, a mechanical resonator comprising a body configured to vibrate according to the input signal and to output a vibration signal, a phase detector configured to detect a relative phase of the vibration signal with respect to the input signal, and a frequency synthesizer configured to produce a temperature-insensitive oscillation output based on the relative phase. The input signal generator comprises an adder configured to add the drive amplitude to the tone amplitude to produce an amplified pilot tone, and a mixer configured to modulate the amplified pilot tone with the drive frequency to produce the input signal. The oscillator further comprises a temperature compensator determines a multiplier to scale the relative phase, wherein the frequency synthesizer performs a scale operation on the vibration signal by the multiplier to produce the temperature-insensitive oscillation output.