Clock Signal Frequency Tuning for Physical Quantity Detection Circuits
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Solution Overview
Problem
Existing circuit devices for physical quantity detection face performance deterioration due to the influence of drive frequency components from physical quantity transducers on detection circuits operating through clock signals, particularly when high-speed operations are required.
Innovation Solution
A circuit device with a clock signal generation circuit that includes first and second frequency adjustment units to adjust the oscillation frequency before and after connection with the physical quantity transducer, using a CR oscillation circuit and variable resistance and capacitance circuits to minimize interference and optimize detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a clock signal generation circuit with oscillation circuit is provided to enable high-speed operations of detection circuits, then the high-speed operations of A/D conversion circuit or DSP unit are realized, but the drive frequency component of the drive signal influences the detection circuit through the clock signal, leading to detection performance deterioration
Solution Approach 1:
The patent applies parameter changes by adjusting the oscillation frequency of the clock signal generation circuit to avoid overlap with the drive frequency component. The control unit dynamically changes the oscillation frequency parameter based on the drive frequency, ensuring that the detection circuit operates at high speed while avoiding interference that would deteriorate detection performance.
2Device complexity
If the drive frequency of the drive signal is kept low (50 to 150 KHz), then the circuit operation is simplified, but high-speed operations of detection circuits cannot be realized
Solution Approach 1:
The patent segments the frequency management into two independent parts: the drive circuit operates at low frequency (50-150 KHz) for simplicity, while the clock signal generation circuit operates at high frequency for fast detection circuit operations. This segmentation allows each circuit to operate optimally without compromising the other, enabling both low complexity and high speed.
3Ease of manufacture
If frequency adjustment is performed only before connection with physical quantity transducer, then manufacturing process is simplified, but detection performance deterioration cannot be adequately prevented due to variations in drive frequency
Solution Approach 1:
The patent implements preliminary frequency adjustment before connection with the physical quantity transducer to establish a baseline oscillation frequency. This preliminary action simplifies the manufacturing process while still providing frequency management capability. The system is pre-configured to handle frequency variations that may occur after connection.
Solution Approach 2:
The patent incorporates feedback mechanisms where the control unit monitors the drive frequency and dynamically adjusts the oscillation frequency of the clock signal generation circuit. This feedback loop ensures that detection performance is maintained despite variations in drive frequency, preventing deterioration while keeping the manufacturing process relatively simple.
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
The solution effectively reduces detection performance deterioration by allowing precise adjustment of oscillation frequencies, enabling high-speed operations and maintaining detection accuracy despite interference from drive frequency components.
Implementation Method 1
a clock signal generation circuit, including an oscillation circuit, which generates a clock signal through the oscillation circuit
Implementation Method 2
a first frequency adjustment unit which is capable of adjusting an oscillation frequency of the oscillation circuit
Implementation Method 3
a second frequency adjustment unit which is capable of adjusting the oscillation frequency of the oscillation circuit
Data Source
AI summary
A circuit device includes a clock signal generation circuit that generates a clock signal through an oscillation circuit, and a detection circuit including a circuit operating through an operation signal based on the clock signal. The clock signal generation circuit includes a first frequency adjustment unit which is capable of adjusting an oscillation frequency before an physical quantity transducer and the circuit device are connected to each other, and a second frequency adjustment unit which is capable of adjusting the oscillation frequency in a state where the physical quantity transducer and the circuit device are connected to each other.