Gyro Sensor Reference Voltage Stabilization
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Solution Overview
Problem
Existing gyro sensors face reduced detection accuracy due to fluctuations in power supply voltage affecting the reference voltage, which impacts both the A/D converter's conversion accuracy and the angular rate detection sensitivity, especially in miniaturized apparatus where complex circuit configurations are not feasible.
Innovation Solution
A shared reference voltage generation circuit supplies a common reference voltage to both the gyro sensor detection circuit and the A/D converter, ensuring that the output remains stable and accurate despite power supply voltage fluctuations by maintaining identical fluctuation rates for all reference voltages, allowing the gyro sensor to maintain sensitivity and full scale voltage integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate reference voltage generation circuits are used for the detection circuit and A/D converter, then each circuit can be independently optimized, but the detection accuracy is reduced due to reference voltage fluctuations affecting both circuits differently
Solution Approach 1:
The patent merges the reference voltage generation circuits by making the A/D converter's reference voltage depend on the detection circuit's reference voltage. Specifically, the A/D converter uses a reference voltage that is a fixed ratio (e.g., 1.5 times) of the detection circuit's reference voltage, ensuring both circuits experience reference voltage fluctuations in the same proportion, thereby maintaining detection accuracy while simplifying the overall system.
2Reliability
If a ratiometric function with power supply voltage dependence circuit and multiplication circuit is added, then the output stability under power supply voltage fluctuation is improved, but the circuit configuration becomes complex and large
Solution Approach 1:
The patent eliminates the need for separate power supply voltage dependence circuits and multiplication circuits by integrating the reference voltage generation into a unified system. The A/D converter simply uses a scaled version of the detection circuit's reference voltage, achieving power supply voltage compensation without adding complex circuitry.
Solution Approach 2:
The detection circuit's reference voltage generation circuit serves dual purposes: it provides the reference voltage for the detection circuit itself and, through a fixed ratio relationship, provides the reference voltage for the A/D converter as well. This multi-functionality eliminates the need for separate reference voltage circuits.
Data Source
AI summary
Disclosed is an angular rate detection apparatus which provides a stable output with high detection accuracy regardless of a fluctuation of a reference voltage accompanying a fluctuation of a power supply voltage. The angular rate detection apparatus includes at least a gyro sensor detection circuit connected to an oscillator, an A/D converter, a digital calculation device, and a reference voltage generation circuit. The gyro sensor detection circuit drives the oscillator, and detects an angular rate acting on the oscillator and outputs an analog detection signal. The A/D converter converts the output analog detection signal into a digital signal. The digital calculation device carries out a calculation based on the converted digital signal. The reference voltage generation circuit supplies a common reference voltage generation circuit supplies a common reference voltage to the gyro sensor detection circuit and the A/D converter.