Oscillator Temperature Compensation Under Supply Voltage Variation
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Solution Overview
Problem
Existing temperature compensation systems for oscillators fail to appropriately reflect variations in power supply voltage and offset adjustments, leading to degraded linearity and changed gradient characteristics in temperature detection voltages, resulting in inaccurate oscillation frequency control.
Innovation Solution
A circuit device incorporating a temperature sensor, offset adjustment circuit, correction voltage output circuit, and correction circuit to correct temperature detection voltage based on power supply and offset adjustment voltages, ensuring accurate temperature compensation of oscillation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor directly outputs temperature detection voltage without separate correction circuits, then the device complexity is reduced, but the temperature compensation accuracy deteriorates due to inability to separately correct power supply voltage variations and offset adjustments
Solution Approach 1:
The patent segments the temperature detection and correction function into three independent circuits: a temperature sensor that outputs raw temperature detection voltage, an offset adjustment circuit that corrects power supply voltage variations, and a correction circuit that adjusts offset characteristics. This segmentation allows each circuit to specialize in one correction task, improving overall temperature compensation accuracy while maintaining manageable circuit complexity through functional separation.
Solution Approach 2:
The patent introduces intermediate correction circuits between the temperature sensor and the temperature compensation circuit. The offset adjustment circuit acts as an intermediary to eliminate power supply voltage variations before the signal reaches the correction circuit, which then serves as another intermediary to adjust offset characteristics. These intermediary circuits improve measurement precision without requiring complete redesign of the entire system.
2Ease of manufacture
If offset adjustment is performed within the temperature sensor itself, then the number of components is reduced, but the linearity of temperature detection voltage deteriorates
Solution Approach 1:
The patent separates the offset adjustment function from the temperature sensor by introducing a dedicated offset adjustment circuit. This segmentation allows the temperature sensor to maintain its original linear characteristics while the offset correction is performed independently in a separate circuit stage, preserving manufacturing precision without increasing the overall component count significantly.
Solution Approach 2:
The patent extracts the offset adjustment function from the temperature sensor and places it in a separate offset adjustment circuit. This extraction allows the temperature sensor to focus solely on accurate temperature detection with maintained linearity, while the offset correction is handled by a specialized circuit designed specifically for that purpose, improving overall system performance.
3Device complexity
If power supply voltage variations are not corrected separately, then the circuit complexity is reduced, but the gradient characteristics of temperature detection voltage change
Solution Approach 1:
The patent applies preliminary action by introducing an offset adjustment circuit before the correction circuit in the signal path. This offset adjustment circuit pre-corrects power supply voltage variations before the signal proceeds to the correction circuit, ensuring that gradient characteristics remain stable throughout subsequent processing stages without requiring complex restructuring of the entire circuit.
Solution Approach 2:
The patent implements feedback mechanisms where the offset adjustment circuit receives input about power supply voltage variations and automatically adjusts its correction output accordingly. This feedback approach maintains gradient characteristics stability by continuously compensating for power supply variations without requiring manual intervention or complex circuit redesign.
Data Source
AI summary
A circuit device that operates by being supplied with a power supply voltage includes an oscillation circuit configured to oscillate a resonator; a temperature sensor configured to output a temperature detection voltage; an offset adjustment circuit configured to output an offset adjustment voltage of the temperature detection voltage; a correction voltage output circuit configured to receive inputs of the power supply voltage and the offset adjustment voltage and output a correction voltage that changes in accordance with the power supply voltage and the offset adjustment voltage; a correction circuit configured to receive inputs of the temperature detection voltage and the correction voltage and output a temperature detection voltage corrected with the correction voltage; and a temperature compensation circuit configured to perform temperature compensation of an oscillation frequency of the oscillation circuit based on the corrected temperature detection voltage.