Vibrating Reed Drive Circuit Clock Signal Merging
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Solution Overview
Problem
Existing circuit devices for detecting physical quantities, such as gyro sensors, face issues in obtaining accurate arithmetic results due to variations in clock signal frequency caused by process or environmental changes, leading to incorrect calculations of angles or other physical quantities.
Innovation Solution
A circuit device that includes a drive circuit to drive a vibrating reed, a detection circuit to output physical quantity information, and an arithmetic processing unit that performs calculations using time interval information defined by the drive frequency, reducing the impact of frequency variations and ensuring more accurate results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a general clock signal generation circuit with only an oscillation circuit is used for arithmetic processing, then the device complexity is reduced, but the measurement precision deteriorates due to frequency variation
Solution Approach 1:
The patent merges the clock signal generation function with the drive circuit by having the drive circuit generate both the drive signal for the vibrating reed and the clock signal for arithmetic processing. This eliminates the need for a separate oscillation circuit, reducing device complexity while ensuring the clock frequency is tied to the drive frequency, thereby maintaining measurement precision.
Solution Approach 2:
The drive circuit serves dual purposes: driving the vibrating reed and generating the clock signal for arithmetic processing. By making the drive circuit self-sufficient for both functions, the patent reduces the overall device complexity while ensuring that the clock frequency naturally tracks with the drive frequency, preventing measurement errors.
2Ease of operation
If the clock frequency varies due to process or environmental variation, then the ease of operation is maintained, but the reliability of arithmetic results deteriorates
Solution Approach 1:
The patent establishes a feedback relationship where the clock signal frequency is determined by the drive circuit's operating frequency. Since the drive circuit adjusts its frequency based on the vibrating reed's resonance characteristics, the clock frequency automatically adapts to maintain accurate arithmetic processing results, creating a self-regulating system that ensures reliability.
Solution Approach 2:
The patent makes the clock frequency dynamic by tying it to the drive circuit's operating frequency rather than using a fixed frequency oscillator. This allows the system to automatically adjust the clock frequency in response to process or environmental variations, maintaining reliable arithmetic results without requiring manual recalibration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables more accurate arithmetic processing by stabilizing the drive frequency and using it to define time intervals, thereby reducing errors in physical quantity calculations and improving the reliability of results.
Implementation Method 1
a drive circuit (30) that drives a vibrating reed (10)
Data Source
AI summary
A circuit device includes a drive circuit which drives a vibrating reed; a detection circuit which outputs physical quantity information corresponding to the physical quantity, based on a detection signal according to a physical quantity that is output from the vibrating reed; and an arithmetic processing unit which performs arithmetic processing, based on the physical quantity information from the detection circuit and time interval information that is defined by a drive frequency of the drive circuit.