Oscillator A/D Mode Switching for Stable Temperature Compensation
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Solution Overview
Problem
Existing A/D conversion circuits in temperature-compensated oscillators face challenges in minimizing frequency drift, leading to communication errors and GPS locking issues due to variations in temperature detection data, which are not addressed effectively by current technologies.
Innovation Solution
A circuit device with an A/D conversion circuit that switches between two modes of operation based on predetermined conditions, using different A/D conversion methods to manage temperature detection data, ensuring minimal changes and accurate frequency control, incorporating a digital signal processing circuit for temperature compensation and an interface for mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single A/D conversion method is used to suppress variations in temperature detection data, then frequency drift is reduced, but response time to sudden temperature changes increases
Solution Approach 1:
The A/D conversion circuit dynamically switches between first and second A/D conversion methods based on temperature change conditions. When sudden temperature changes are detected, the circuit uses the first conversion method for rapid response; during stable temperature periods, it uses the second conversion method for high precision. This dynamic adaptation resolves the contradiction between response speed and measurement accuracy.
Solution Approach 2:
The invention changes the conversion precision parameter based on temperature stability conditions. The A/D conversion circuit adjusts its conversion method (first or second) according to whether sudden temperature changes are detected, thereby optimizing the balance between response time and measurement precision for temperature detection data.
2Measurement precision
If A/D conversion precision is increased to improve temperature detection accuracy, then frequency control accuracy improves, but conversion time increases
Solution Approach 1:
The A/D conversion circuit dynamically selects between first and second conversion methods based on whether sudden temperature changes are detected. This dynamic selection allows the system to achieve high measurement precision when needed while minimizing conversion time during rapid temperature transitions, resolving the contradiction between accuracy and speed.
Solution Approach 2:
The invention applies different levels of conversion precision selectively: the first conversion method provides sufficient precision for rapid temperature changes, while the second conversion method provides higher precision for stable temperature conditions. This partial application of excessive precision only when necessary optimizes the balance between accuracy and conversion time.
3Reliability
If temperature detection data changes are suppressed to minimize frequency hopping, then communication reliability improves, but temperature response speed decreases
Solution Approach 1:
The system dynamically adjusts temperature detection data output based on temperature change conditions. When sudden temperature changes are detected, the circuit outputs data rapidly using the first conversion method; during stable periods, it suppresses unnecessary changes using the second conversion method. This dynamic adjustment maintains communication reliability while preserving temperature response speed.
Solution Approach 2:
The invention changes the data output parameter (change suppression level) based on temperature stability. The A/D conversion circuit adjusts whether to suppress data changes according to the detected temperature condition, optimizing the balance between communication reliability and temperature response speed.
Data Source
AI summary
A circuit device includes an A/D conversion circuit that performs A/D conversion on a temperature detection voltage from a temperature sensor so as to output temperature detection data, and a digital signal processing circuit that performs a temperature compensation process on the basis of the temperature detection data, in which the A/D conversion circuit operates in a first mode, and switches to a second mode in a case where a predetermined condition is established.