Oscillator Temperature Compensation with Adaptive Detection Rate
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Solution Overview
Problem
Existing quartz crystal oscillators face challenges in maintaining accurate oscillation frequencies due to temperature variations, as their temperature correction mechanisms may not effectively follow sudden changes in ambient temperature, leading to potential frequency deviations.
Innovation Solution
A circuit device comprising an oscillation circuit, temperature detection circuit, temperature compensation circuit, and temperature detection rate control circuit, which dynamically adjusts the temperature detection rate based on temperature variations to ensure accurate frequency compensation, using a temperature detection rate control circuit that adapts the detection rate according to the temperature data to maintain a constant oscillation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature correction control frequency is increased at specific timing (power supply start-up), then the temperature correction stability improves, but the temperature correction cannot follow temperature variations occurring at other timings
Solution Approach 1:
The patent applies dynamics by making the temperature detection rate adjustable rather than fixed. The temperature detection rate control circuit dynamically changes the detection rate based on whether the oscillation circuit has completed its start-up process. During start-up, the detection rate is set to a first (lower) rate, and after start-up completion, it switches to a second (higher) rate, enabling the system to adapt to different operational states and effectively follow temperature variations at any timing.
Solution Approach 2:
The patent changes the parameter of temperature detection rate based on the operational state of the oscillation circuit. By switching between a first temperature detection rate during start-up and a second temperature detection rate after start-up, the system optimizes temperature correction performance for different phases of operation, ensuring both stability during initialization and responsiveness to temperature variations during normal operation.
2Reliability
If the temperature detection rate is continuously high, then the temperature variation following capability improves, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts the temperature detection rate based on the operational state. During the start-up phase, when the oscillation circuit is stabilizing, the temperature detection rate is reduced to the first rate, lowering power consumption. After start-up completion, when the circuit is stable and needs to follow temperature variations, the rate increases to the second rate, ensuring accurate temperature compensation without unnecessary power consumption during transient phases.
Solution Approach 2:
The patent implements periodic action by switching between two distinct temperature detection rates based on the start-up status. The system alternates between a lower detection rate during start-up and a higher detection rate during normal operation, optimizing the balance between temperature following capability and power consumption through time-based rate adjustment.
Data Source
AI summary
A circuit device includes an oscillation circuit that generates an oscillation signal using a resonator, a temperature detection circuit that outputs temperature detection data, a temperature compensation circuit, and a temperature detection rate control circuit. The temperature compensation circuit performs temperature compensation on an oscillation frequency of the oscillation signal based on the temperature detection data. The temperature detection rate control circuit controls a temperature detection rate at which the temperature detection circuit executes temperature detection. At this time, the temperature detection rate control circuit controls the temperature detection rate based on a variation in the temperature detection data.