Oscillator Temperature Compensation for Fast Frequency Stabilization
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Solution Overview
Problem
Existing oscillators face challenges in stabilizing oscillation frequency quickly during activation, as they require high-speed temperature detection data for temperature compensation, but traditional methods often result in inaccurate data and prolonged stabilization times due to noise and signal delays from digital filter processing.
Innovation Solution
A circuit device incorporating an A/D conversion circuit, digital filter, selector, and oscillation signal generation circuit, where A/D output temperature detection data is used during activation and filtered data during normal operation to ensure rapid frequency stabilization, utilizing different A/D conversion methods and digital filter processing to achieve accurate temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital filter processing is applied to A/D output temperature detection data, then measurement precision of temperature detection data is improved, but response time increases causing delay in oscillation frequency stabilization
Solution Approach 1:
The patent applies dynamics by making the data processing mode changeable based on operational state. The switching unit dynamically selects between first processing mode (with digital filter for high accuracy) and second processing mode (without digital filter for fast response) according to whether the oscillation frequency is already stabilized, allowing the system to adapt its processing characteristics to current operational requirements
Solution Approach 2:
The patent changes the processing parameter (application of digital filter) based on the stabilization state of oscillation frequency. When the frequency is not stabilized, the system uses a processing mode that prioritizes speed (second processing unit without digital filter). When stabilized, it switches to a mode that prioritizes accuracy (first processing unit with digital filter), thus dynamically adjusting parameters to resolve the contradiction
2Speed
If high-speed A/D conversion is performed during activation period, then response speed is improved, but measurement precision may be compromised due to noise
Solution Approach 1:
The system dynamically adjusts the processing mode based on the operational state. During activation period when fast response is needed, the second processing unit (high-speed mode without digital filter) is used. Once stabilization is achieved, the system transitions to the first processing unit (normal mode with digital filter) to improve accuracy, thus dynamically balancing speed and precision requirements
Solution Approach 2:
The patent implements periodic action by alternating between different processing modes based on time-based activation period and stabilization state. The system performs high-speed conversion during activation, then periodically switches to filtered processing after stabilization, creating a rhythmic pattern of processing that addresses both speed and accuracy needs at different phases
Data Source
AI summary
A circuit device includes an A/D conversion circuit that performs an A/D conversion of a temperature detection voltage, a digital filter that performs digital filter processing of A/D output temperature detection data, a selector that selects A/D output temperature detection data during an activation period and selects filter output temperature detection data during a normal operation period after the activation period, a digital signal processing circuit that outputs frequency control data of an oscillation frequency based on selector output temperature detection data, and an oscillation signal generation circuit that generates an oscillation signal of an oscillation frequency set by frequency control data.