Resonator Oscillator Calibration for Fast Frequency-Temperature Convergence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resonator oscillators in user equipment (UE) experience significant frequency variations with temperature changes, leading to initial lock failure when starting up or restarting, especially in devices like automobiles exposed to wide temperature ranges, affecting communication with network entities.
Innovation Solution
Implementing a resonator field calibrator that updates a frequency-temperature characteristic model using temperature and frequency vectors to adjust the resonator signal frequency, with power mode management and feedback mechanisms to expedite model convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a resonator oscillator is used to generate LO signals in transceivers, then the device can operate across wide temperature ranges, but frequency drift and lock failure occur due to temperature-induced frequency variations
Solution Approach 1:
The system performs preliminary frequency calibration by collecting frequency-temperature vectors during manufacturing and storing them in a lookup table. This pre-characterization allows the system to compensate for temperature-induced frequency drift without requiring real-time complex measurements, thereby maintaining reliable operation across wide temperature ranges.
Solution Approach 2:
The system implements a feedback mechanism where the measured frequency deviation from the nominal value is used to retrieve the appropriate correction value from the lookup table based on temperature. This closed-loop feedback ensures that frequency drift is continuously compensated, maintaining lock reliability across varying temperature conditions.
2Reliability
If frequency-temperature characteristic modeling is implemented to compensate for drift, then lock reliability improves, but device complexity and calibration overhead increase
Solution Approach 1:
The frequency-temperature characteristic model is built during manufacturing by measuring frequency at various temperatures and storing the data in a lookup table. This preliminary characterization eliminates the need for complex real-time modeling algorithms, reducing device complexity while maintaining high lock reliability through simple table lookup and interpolation operations.
Solution Approach 2:
The system uses a lightweight lookup table structure instead of complex polynomial models or neural networks. This simplified data structure requires minimal processing power and memory, reducing device complexity while effectively compensating for frequency drift through straightforward table-based correction.
3Productivity
If the applications processor operates in high power mode to collect frequency-temperature vectors, then model convergence speed increases, but energy consumption increases
Solution Approach 1:
The frequency-temperature vectors are collected during the manufacturing process when the applications processor can operate in high power mode without concern for energy conservation. This preliminary data collection establishes the calibration model before the device enters service, allowing the device to use low power mode during normal operation while maintaining fast model convergence.
Solution Approach 2:
The system performs frequent frequency measurements and model updates during the initial calibration phase when the device is being set up. This periodic intensive measurement approach quickly converges the model, after which the system transitions to less frequent updates during normal operation, balancing convergence speed with energy consumption.
Data Source
AI summary
An aspect of the disclosure relates to a user equipment (UE) including: at least one antenna; a transceiver coupled to the at least one antenna, wherein the transceiver comprises: a resonator oscillator configured to generate a resonator signal; and a temperature sensor configured to generate a temperature signal related to a temperature of the resonator oscillator; an applications processor coupled to the transceiver; and a resonator field calibrator coupled to the applications processor and the transceiver.