Fiber Optic Gyroscope DAC With Random Current Source Selection
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Solution Overview
Problem
Conventional digital to analog converters for fiber optic gyroscopes suffer from conversion errors due to process variation, limiting their precision and accuracy, especially in high-precision applications.
Innovation Solution
A digital to analog converter design that includes a random unit generating a pseudo random sequence, encoding units converting digital signals to spin signals, and control units converting these signals to logic signals, which are used to select different current sources randomly, forming an analog voltage signal, thereby improving dynamic performance and reducing conversion errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional digital to analog converter is used in fiber optic gyroscope, then the device complexity is reduced, but the manufacturing precision deteriorates due to process variation causing current source mismatch
Solution Approach 1:
The patent implements dynamic element matching by randomly selecting different current sources for each conversion cycle through a random number generator. This dynamic selection process ensures that no single current source is consistently used, thereby distributing the impact of process variations across multiple sources and reducing systematic mismatch errors in the conversion accuracy.
2Device complexity
If conventional digital to analog converter is used, then the device complexity is maintained at low level, but the measurement precision deteriorates due to conversion errors
Solution Approach 1:
The random selection of current sources dynamically changes the conversion path for each measurement cycle, preventing systematic errors from accumulating and improving the overall measurement precision of the fiber optic gyroscope without requiring a fundamentally more complex converter architecture.
Solution Approach 2:
The patent changes the operational parameters by introducing random variation in current source selection, which transforms the conversion process from a static, deterministic operation to a dynamic, probabilistic one, thereby reducing the impact of fixed process variations on measurement precision.
3Manufacturing precision
If more current sources are used to improve accuracy, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
Rather than using all current sources simultaneously or in fixed combinations, the patent employs dynamic random selection to activate only the necessary number of current sources for each conversion cycle. This approach achieves improved linearity and accuracy through statistical distribution of process variations while maintaining manageable device complexity by not requiring all sources to be active at once.
Data Source
AI summary
A digital to analog converter for fiber optic gyroscope is disclosed. The digital to analog converter for fiber optic gyroscope includes a random unit generating a random number signal, a plurality of encoding units coupled with the random unit, a plurality of control units respectively one to one coupled with the plurality of encoding units, a current source array coupled with the plurality of control units, and an output load electrically connected to the current source array. Each of the plurality of encoding units converts a plurality of digital signals to a plurality of spin signals according to the random number signal. Each of the plurality of control units converts the plurality of spin signals to a plurality of logic signals. The current source array generates a total current according to the plurality of logic signals. The total current passes through the output load and forms an analog signal.