Physical Quantity Detection Circuit Voltage Fluctuation Correction
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Solution Overview
Problem
Physical quantity detection devices, such as acceleration and gyro sensors, face challenges in maintaining detection accuracy due to fluctuations in power supply voltage, leading to output variations and potential deterioration in performance, especially in noisy environments.
Innovation Solution
A physical quantity detection circuit that incorporates a power supply voltage fluctuation correction process using a correction expression, such as a quadratic function, to adjust detection signals and arithmetic operation signals, thereby reducing output fluctuations. This correction is performed through digital processing, allowing for increased accuracy and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If physical quantity detection devices are designed to accept a wide range of power supply voltages for general use, then adaptability is improved, but output fluctuation due to power supply voltage changes occurs, worsening reliability
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gain of the amplification circuit based on the detected power supply voltage level. When the power supply voltage fluctuates, the gain is adjusted accordingly to compensate for the voltage change, thereby maintaining stable output signals across a wide power supply voltage range while ensuring reliability
2Reliability
If correction processes are added to reduce output fluctuation, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by integrating the power supply voltage detection function and the gain adjustment function into a single correction circuit block. The correction circuit simultaneously performs voltage monitoring and signal correction, reducing the need for separate dedicated circuits and thereby limiting the increase in device complexity while improving reliability
Solution Approach 2:
The patent employs feedback mechanisms where the power supply voltage detection circuit continuously monitors the voltage level and feeds this information back to the correction circuit. The correction circuit then adjusts the amplification gain based on this feedback, creating a closed-loop system that automatically compensates for voltage fluctuations without requiring complex external control
Data Source
AI summary
A detection circuit (physical quantity detection circuit) includes a digital arithmetic operation circuit (arithmetic operation processing portion) that performs an arithmetic operation process of generating an arithmetic operation signal according to a magnitude of a physical quantity, on the basis of a detection signal corresponding to the physical quantity. The digital arithmetic operation circuit performs an arithmetic operation process including a power supply voltage fluctuation correction process of correcting at least one of the detection signal and a signal which is obtained by a portion of the arithmetic operation process with respect to the detection signal, on the basis of a correction expression using a power supply voltage to be supplied as a variable.