MEMS Oscillator Temperature Reporting for Frequency Compensation
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Solution Overview
Problem
High precision timing devices face challenges in accurately reporting temperature and compensating for temperature-dependent frequency offsets, which affects the stability and accuracy of timing signals over varying temperatures.
Innovation Solution
Integration of a MEMS resonator and temperature transducer within a small form-factor IC package that outputs both timing signals and temperature data, enabling temperature-specific frequency compensation by providing coefficients for polynomial expressions or direct frequency correction values, thus allowing for temperature-compensated timing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation is implemented using polynomial expressions with multiple coefficients, then timing signal accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the temperature transducer, polynomial coefficient storage, and frequency compensation logic into a single integrated oscillator device. This merging allows the complex temperature compensation function to be implemented without proportionally increasing overall device complexity, as all components work together in a unified system rather than as separate external components.
Solution Approach 2:
The patent uses polynomial expressions with temperature-dependent coefficients to dynamically adjust the frequency output based on measured temperature. By changing the operational parameters (frequency correction values) based on temperature measurements, the system achieves high timing accuracy without requiring complex mechanical or structural adjustments.
2Measurement precision
If a temperature transducer is integrated within the oscillator package, then temperature tracking accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The temperature transducer is physically integrated within the oscillator package, combining temperature sensing and timing functions in a single device. This integration improves temperature tracking accuracy by placing the sensor close to the resonator, while the patent simplifies manufacturing by providing predetermined polynomial coefficients that account for device-specific characteristics, eliminating the need for complex calibration procedures.
Solution Approach 2:
The polynomial coefficients are determined in advance during device fabrication or initialization, before the device is deployed. This preliminary characterization allows the device to automatically compensate for its specific temperature characteristics without requiring complex runtime calibration or adjustment procedures, thereby simplifying manufacturing and deployment.
3Stability of the object's composition
If frequency compensation values are stored as predetermined polynomial coefficients, then timing stability is improved, but memory requirements increase
Solution Approach 1:
The patent represents frequency compensation data as polynomial coefficients rather than storing complete lookup tables or complex compensation algorithms. This parameter-based representation achieves high timing stability through mathematical modeling while minimizing memory requirements, as only a few coefficient values are needed to describe the temperature-frequency relationship across the entire operating range.
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 solution ensures accurate and stable timing signals across a wide temperature range by effectively tracking resonator temperature and applying necessary frequency corrections, reducing voltage switching noise and enabling compact, low-thermal-resistance designs.
Implementation Method 1
a MEMS resonator and temperature transducer—generally a temperature-to-digital converter (TDC)—are integrated within a small form-factor integrated circuit (IC) package that outputs both a timing signal according to mechanical vibration of the MEMS resonator
Implementation Method 2
a MEMS resonator and temperature transducer—generally a temperature-to-digital converter (TDC)—are integrated within a small form-factor integrated circuit (IC) package
Data Source
AI summary
In an integrated circuit device having a microelectromechanical-system (MEMS) resonator and a temperature transducer, a clock signal is generated by sensing resonant mechanical motion of the MEMS resonator and a temperature signal indicative of temperature of the MEMS resonator is generated via the temperature transducer. The clock signal and the temperature signal are output from the integrated circuit device concurrently.