Integrated Temperature Measurement Device for Optical Disc Drives
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Solution Overview
Problem
Conventional temperature measurement devices for optical disc drives are costly due to the presence of external resistors, which affect the accuracy of temperature measurement and increase the overall cost.
Innovation Solution
A temperature measurement device integrated into a single chip, comprising a thermistor, a resistor, a determination circuit, and a measurement circuit, which calculates the environment temperature using a specific formula, compensation, or lookup table to account for process variations in the resistor's impedance value, eliminating the need for external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external resistor is used in the temperature measurement device, then the temperature measurement function is achieved, but the total cost increases and device complexity increases
Solution Approach 1:
The patent merges the resistor and determination circuit into a single integrated circuit chip, eliminating the need for external resistor components. The resistor is implemented as an on-chip element, and the determination circuit integrates the functionality of measuring the resistor's impedance value to compensate for process variations, thereby reducing device complexity while maintaining measurement precision.
2Measurement precision
If an external resistor is used in the temperature measurement device, then the temperature measurement function is achieved, but the total cost increases
Solution Approach 1:
The patent combines multiple functional elements (resistor, determination circuit, measurement circuit) into a single integrated circuit, eliminating the need for external resistor components. This integration reduces the number of components that need to be manufactured, assembled, and tested, thereby reducing manufacturing cost while maintaining temperature measurement accuracy.
Solution Approach 2:
The integrated circuit performs self-compensation by automatically measuring its own resistor impedance value and using this information to correct temperature measurement errors. The determination circuit within the IC measures the actual impedance of the on-chip resistor and uses this to compensate for process variations, eliminating the need for external compensation components.
3Ease of manufacture
If the resistor impedance value varies due to process variations, then manufacturing is simplified, but the measurement accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the determination circuit continuously measures the actual impedance value of the resistor and uses this information to compensate for deviations from the nominal value. The measurement circuit uses the measured impedance value to calculate the correct temperature, thereby maintaining measurement accuracy despite process variations in resistor manufacturing.
Solution Approach 2:
The patent dynamically adjusts the measurement parameters based on the actual resistor impedance value. Instead of using a fixed nominal resistance value, the system measures the actual impedance and uses this real parameter value in the temperature calculation formula, thereby adapting to process variations and maintaining measurement accuracy.
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 solution provides accurate temperature measurement within optical disc drives without external resistors, reducing costs and minimizing the impact of process variations on measurement accuracy.
Implementation Method 1
The thermistor has a specific impedance value at a specific environment temperature point
Data Source
AI summary
A temperature measurement device is provided to measure an environment temperature and includes a thermistor, a resistor, a determination circuit, and a measurement circuit. The thermistor is coupled to a first node. The thermistor has a specific impedance value at a specific environment temperature point. The resistor has a first terminal coupled to the first node. The determination circuit determines a real impedance value of the resistor. The measurement circuit is coupled to the first node for receiving a measurement value signal generated at the first node and obtains a value of the specific environment temperature point according to the measurement value signal and the real impedance value of the resistor.