Oscillator IC Temperature Compensation Using Local Basis Functions
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Solution Overview
Problem
Existing oscillator temperature compensation methods face challenges in achieving precise temperature error compensation without increasing the size of components, leading to imprecision and higher manufacturing costs due to the need for extensive temperature calibration and expensive ovens.
Innovation Solution
The use of a sum function consisting of local compensation basis functions, such as arc tangent, logistic, and hyperbolic tangent functions, in the temperature compensation block of an integrated circuit to model temperature changes, allowing for precise calibration and reduced component size, eliminating the need for temperature variations during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional polynomial temperature compensation methods are used, then the oscillator can be manufactured with standard components, but the temperature compensation precision is insufficient and residual errors remain high
Solution Approach 1:
The patent transforms the temperature compensation problem from using global polynomial functions to using local basis functions (Gaussian, Lorentzian, Cauchy-Lorentz) with adjustable parameters. Each basis function targets specific temperature regions, allowing precise modeling of frequency-temperature characteristics by changing functional parameters rather than using fixed-order polynomials.
Solution Approach 2:
The temperature compensation function is segmented into multiple local basis functions, each responsible for compensating frequency errors in specific temperature ranges. This segmentation allows the system to achieve high precision across the entire temperature range by combining localized compensation effects rather than using a single global approximation.
2Manufacturing precision
If expensive ovens are used for temperature control, then frequency stability is improved, but manufacturing costs and device size increase significantly
Solution Approach 1:
The patent replaces the mechanical/thermal oven control system with an electronic compensation system using integrated circuits that calculate and apply correction signals based on temperature sensor data. This substitution eliminates the need for expensive thermal control hardware while achieving equivalent or superior frequency stability through computational methods.
Solution Approach 2:
Instead of physically controlling the temperature environment with ovens, the system creates a virtual model of the frequency-temperature relationship using basis functions. This mathematical copy of the physical phenomenon allows the system to predict and compensate for temperature effects without actually maintaining controlled temperature conditions.
3Measurement precision
If extensive temperature calibration is performed, then compensation accuracy is improved, but manufacturing time and complexity increase
Solution Approach 1:
The patent performs preliminary characterization of the oscillator's frequency-temperature characteristics during manufacturing by measuring at a limited set of temperature points. These measurements are used to fit the basis function parameters in advance, creating a pre-calibrated compensation model that requires minimal additional calibration time while achieving high accuracy across the full temperature range.
Solution Approach 2:
By using basis functions with adjustable parameters that can be fitted to limited measurement data, the system reduces the number of calibration points needed compared to traditional polynomial methods. The parameter-fitting process efficiently extracts compensation characteristics from minimal measurements, significantly reducing calibration time while maintaining high accuracy.
Data Source
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AI summary
The present invention relates in general to electronic oscillation generators and to the stabilization of electronic oscillation generators, and especially to temperature- compensated oscillator units used in electronics and telecommunications technology, for example, as well as to a method and integrated circuit for temperature compensation of oscillators. The temperature-compensated oscillator unit according to the invention that comprises an integrated circuit (12) and oscillator (10) is characterised in that said oscillator (10) has a known temperature compensation function and that said integrated circuit (12) of the oscillator unit comprises a temperature compensation block (14) having at least two local compensation basis functions ϕ j ,,j = 0,..., k for selection for at least one oscillator (10) of a specific type, an internal temperature sensor (11) and a data block (13) for calibrating said temperature compensation block (14) in the temperature range to be used, and several differential pairs, with which the temperature compensation of the oscillator (10) is implemented.