Oscillator Frequency Control Using Lookup-Based Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional oscillators face instability and increased power consumption due to variations in environmental factors like temperature and power voltage, requiring complex and costly compensation circuits to maintain stable operation.
Innovation Solution
An oscillator comprising a data storage unit, an oscillation unit, and a control unit that adjusts the oscillation frequency by generating a control code based on reference condition and control codes, allowing the oscillation unit to output a frequency that matches a target frequency despite environmental changes, using a simple and low-cost reference voltage generation unit and a capacitor unit with variable capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compensation circuits are used to maintain stable oscillation frequency under temperature and voltage variations, then frequency stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a lookup table that stores pre-calibrated control codes corresponding to different temperature conditions. Instead of implementing complex real-time compensation circuits, the system creates a digital copy of the compensation data and retrieves the appropriate control code based on detected temperature, thereby simplifying the hardware while maintaining frequency stability
Solution Approach 2:
The patent replaces analog compensation circuits with a digital control approach. A microcontroller or digital logic unit reads temperature from a sensor, queries the lookup table for the corresponding control code, and adjusts the oscillation frequency through digital signaling, substituting complex analog circuitry with a simpler digital system
2Reliability
If complex compensation circuits are implemented to compensate for temperature differences, then frequency stability is improved, but power consumption increases
Solution Approach 1:
By storing compensation data in a lookup table rather than implementing active compensation circuits, the system consumes power only for temperature sensing and digital code retrieval, significantly reducing power consumption compared to continuously active analog compensation circuits while maintaining frequency stability
3Reliability
If high-cost temperature-insensitive reference voltage generators are used, then frequency stability is improved, but cost increases
Solution Approach 1:
The patent uses a lookup table that contains pre-determined control codes for compensating frequency drift under different temperature conditions. This digital compensation approach replaces the need for expensive temperature-insensitive reference voltage generators, achieving frequency stability through software-based correction rather than expensive hardware
Solution Approach 2:
The system changes the control code parameter based on detected temperature conditions to compensate for frequency drift. By dynamically adjusting the control code rather than relying on expensive temperature-insensitive components, the patent achieves frequency stability at lower cost
Data Source
AI summary
An oscillator comprises a data storage unit, an oscillation unit, and a control unit. The data storage unit is adapted to store a plurality of reference condition codes and a plurality of reference control codes. The oscillation unit is adapted to output an oscillation signal having an oscillation frequency that varies according to a control code. The control unit is adapted to generate the control code with a target value based on the reference condition codes and the reference control codes and a current condition code input to the control unit. Where control code has the target value, the oscillation unit outputs the oscillation signal with the oscillation frequency substantially equal to a target oscillation frequency.