Dual-Circuit Oscillator Temperature Compensation for Stable Clock Frequency
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Solution Overview
Problem
Existing temperature compensation oscillators face challenges in achieving high accuracy due to micro-jumps in frequency caused by temperature measurement variations, leading to difficulties in maintaining precise clock frequencies.
Innovation Solution
A dual-circuit oscillator configuration where the first circuit generates a clock signal and performs coarse temperature compensation, and the second circuit further refines the frequency compensation, reducing micro-jumps by performing fine adjustments based on temperature detection data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital-mode temperature compensation processing is performed using a temperature correction table, then temperature compensation is achieved, but micro-jumps in frequency occur due to variations in temperature measurement results
Solution Approach 1:
The patent divides the temperature compensation processing into two separate circuit devices: a first circuit device that performs coarse temperature compensation by adjusting the oscillation frequency of the resonator, and a second circuit device that performs fine frequency adjustment by multiplying the frequency. This segmentation allows each device to specialize in one aspect of compensation, reducing the impact of temperature measurement variations on overall frequency stability
Solution Approach 2:
The first clock signal serves as an intermediary between the temperature measurement and the final second clock signal. The first circuit device generates this intermediate signal with coarse compensation, which then feeds into the second circuit device for further refinement. This intermediary step isolates the frequency multiplication process from direct temperature measurement variations
2Measurement precision
If the gain of temperature compensation is increased to improve accuracy, then frequency accuracy improves, but the micro-jump problem worsens
Solution Approach 1:
The patent segments the compensation gain into two stages: the first circuit device applies a first gain for coarse compensation, and the second circuit device applies a second gain for fine adjustment during frequency multiplication. This allows the system to achieve high overall accuracy without concentrating all compensation gain in one stage, which would amplify micro-jumps
Solution Approach 2:
Each circuit device is assigned different local qualities in terms of compensation characteristics. The first circuit device operates with characteristics optimized for coarse adjustment and stability, while the second circuit device is optimized for fine frequency tuning. This local differentiation allows each component to perform its specific function optimally without compromising overall system reliability
Data Source
AI summary
Provided is an oscillator including: a resonator; a first circuit device electrically coupled to the resonator; and a second circuit device. The first circuit device generates a first clock signal by causing the resonator to oscillate, and performs first temperature compensation processing for temperature compensating a frequency of the first clock signal. The second circuit device receives the first clock signal from the first circuit device, generates a second clock signal based on the first clock signal, and performs second temperature compensation processing for temperature compensating a frequency of the second clock signal.