Current Generating Circuit Temperature Coefficient Slope Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current current generating circuits fail to accurately adjust the temperature coefficient slope to meet the stringent requirements of modern electronic equipment, which are affected by Process, Voltage, and Temperature (PVT) variations, leading to reduced temperature detection accuracy.
Innovation Solution
A current generating circuit comprising subunits that generate currents with negative and positive temperature coefficients, allowing for flexible adjustment of the temperature coefficient slope through current subtraction and amplification using current mirror circuits and Bandgap regulators, enabling precise temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional current generating circuits are used, then the circuit structure is simple, but the temperature detection accuracy is insufficient due to inability to adjust temperature coefficient slope
Solution Approach 1:
The current generating circuit is divided into multiple independent sub-circuits: a first current generating sub-circuit that generates a first current with a first temperature coefficient, a second current generating sub-circuit that generates a second current with a second temperature coefficient, and a third current generating sub-circuit that generates a third current with a third temperature coefficient based on the difference between the first and second currents. This segmentation allows each sub-circuit to be optimized independently for specific temperature coefficient requirements, thereby improving temperature detection accuracy while maintaining manageable circuit complexity through modular design.
2Adaptability or versatility
If the temperature coefficient slope cannot be adjusted, then the circuit operation is simple, but the adaptability to different temperature detection requirements is poor
Solution Approach 1:
The circuit employs dynamic current combination where the third current is generated based on the difference between the first current and the second current, allowing the temperature coefficient slope to be dynamically adjusted. By controlling the ratios and combinations of currents from different sub-circuits, the circuit can adapt to various temperature detection requirements with different slope requirements, transforming a static circuit into one with adjustable characteristics without overly complicating the operation.
3Reliability
If PVT variations are not compensated, then the circuit design is simple, but the reliability of temperature detection is reduced
Solution Approach 1:
The circuit proactively compensates for PVT (Process, Voltage, Temperature) variations by generating multiple currents with different temperature coefficients and combining them to create a third current with a precisely controlled temperature coefficient slope. This preliminary compensation mechanism counteracts the effects of PVT variations before they degrade detection reliability, embedding robustness directly into the circuit architecture rather than adding separate compensation stages, thus improving reliability while controlling design complexity.
Data Source
AI summary
A current generating circuit includes a first circuit subunit, a second circuit subunit and a third circuit subunit. The first circuit subunit is configured to generate a first current having a first temperature coefficient. The first temperature coefficient is a negative temperature coefficient. The second circuit subunit is configured to generate a second current having a second temperature coefficient. The second temperature coefficient is a positive temperature coefficient. The third circuit subunit is configured to generate a third current having a third temperature coefficient according to a difference between the first current and the second current. An absolute value of a slope of the third temperature coefficient is greater than that of the first temperature coefficient or that of the second temperature coefficient.