Oscillator Temperature Compensation Without Switching Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing temperature compensation circuits in circuit devices with oscillation circuits face challenges in simultaneously reducing power consumption and preventing deterioration of noise characteristics due to noise generated during switching between temperature compensation circuits.
Innovation Solution
The proposed circuit device incorporates a temperature compensation circuit with a first and second reference current generation circuit, which adjust the reference currents based on temperature changes, allowing for efficient temperature compensation in different temperature ranges without unnecessary current consumption or noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If switching circuit is used to switch between low-temperature-side circuit and high-temperature-side circuit, then power consumption is reduced, but noise is generated and noise characteristic of clock signal deteriorates
Solution Approach 1:
The patent applies dynamics by making the reference current dynamically adjustable based on temperature. Instead of using a static switching circuit that abruptly changes between temperature ranges, the reference current is continuously adjusted according to temperature conditions. This dynamic adjustment eliminates abrupt transitions and associated noise while still achieving power consumption reduction by adapting the current level to actual temperature requirements.
Solution Approach 2:
The patent changes the parameter of reference current based on temperature conditions. By adjusting the reference current parameter according to temperature ranges, the circuit achieves power consumption reduction without using abrupt switching. The parameter change approach allows smooth transition between operating conditions, preventing noise generation while maintaining energy efficiency.
2Use of energy by stationary object
If switching between temperature compensation circuits is performed, then power consumption is reduced, but noise characteristic of clock signal deteriorates
Solution Approach 1:
The patent transforms the static switching mechanism into a dynamic system where the reference current automatically adjusts based on temperature feedback. This dynamic behavior eliminates the abrupt transitions that cause noise, while still achieving the power consumption benefits of temperature-range-specific optimization. The noise characteristic is preserved because the transition is smooth and continuous rather than abrupt.
Solution Approach 2:
The patent introduces temperature-based reference current adjustment as an intermediary mechanism between the low-temperature and high-temperature compensation circuits. Instead of directly switching between circuits, the reference current acts as a mediator that smoothly transitions the system state based on temperature conditions, preventing noise generation while maintaining power efficiency.
Data Source
AI summary
A circuit device includes an oscillation circuit configured to generate an oscillation signal and a temperature compensation circuit configured to perform temperature compensation for an oscillation frequency of the oscillation signal. The temperature compensation circuit includes a first reference current generation circuit configured to generate a first reference current, a second reference current generation circuit configured to generate a second reference current, a first compensation circuit configured to perform temperature compensation for the oscillation frequency in a first temperature range based on the first reference current, and a second compensation circuit configured to perform temperature compensation for the oscillation frequency in a second temperature range, which is higher than the first temperature range in temperature, based on the second reference current. The first reference current generation circuit reduces the first reference current as a temperature rises, or the second reference current generation circuit reduces the second reference current as the temperature drops.