Counter-Based Resonator Compensation for Temperature-Stable Timing
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Solution Overview
Problem
Resonator-based clocks, particularly MEMS resonators, face challenges in maintaining accuracy due to temperature variations and initial frequency offsets, which existing methods often address by modifying the resonator design, increasing manufacturing costs and complexity.
Innovation Solution
A timing device and method that utilize a counter and temperature sensor to generate an extraction signal, adjusting the resonator output signal to achieve desired frequency accuracy by accounting for initial frequency offsets and temperature variations without modifying the resonator design, using a combination of integer and fractional counters, memory for storing offsets, and calculators for temperature and aging rate compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MEMS resonator design is modified to control temperature-based frequency variation, then frequency stability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent introduces a counter circuit as an intermediary component between the MEMS resonator and the timing output. This counter measures the resonator's frequency and generates correction signals to compensate for temperature drift, achieving frequency stability without modifying the resonator design itself. The counter acts as a mediator that handles the compensation function separately from the resonator structure.
Solution Approach 2:
The patent replaces mechanical/physical modifications to the resonator structure with an electronic/software-based counter system. Instead of physically adjusting the resonator to account for temperature variations, the system uses digital counting and calculation to measure and correct frequency deviations, substituting mechanical design complexity with electronic compensation.
2Measurement precision
If resonator design is modified to achieve initial frequency accuracy, then frequency accuracy improves, but manufacturing cost and complexity increase
Solution Approach 1:
The patent performs preliminary measurement of the resonator's actual frequency during manufacturing or initialization, stores this information in memory, and uses it to pre-configured the counter. This preliminary action allows the system to compensate for manufacturing variations without requiring expensive precision trimming processes during manufacturing.
Solution Approach 2:
The patent creates a digital copy or representation of the resonator's frequency characteristics in the counter's memory, rather than physically trimming the resonator itself. This digital model allows for precise frequency accuracy to be achieved through software/configuration rather than expensive physical manufacturing processes.
3Reliability
If conventional quartz crystal oscillators are used with parabolic temperature compensation, then frequency stability is maintained within 0-50°C, but accuracy degrades substantially outside this temperature range
Solution Approach 1:
The patent implements a dynamic counter that can adapt its counting parameters based on measured temperature conditions. Rather than using a fixed parabolic compensation curve valid only for 0-50°C, the system dynamically adjusts its compensation strategy to maintain accuracy across a wider temperature range, making the timing device more adaptable to varying environmental conditions.
Data Source
AI summary
Disclosed herein is a timing device that includes a resonator device to generate a resonator output signal at a frequency offset from a desired frequency, a counter configured to generate an extraction signal in accordance with the frequency offset, and a timing signal generator configured to track time with a count based on the resonator output signal and modified by the extraction signal downward to reach the desired frequency.