Temperature-Sensing Circuit With Dynamic SAR Search Segments
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Solution Overview
Problem
Integrated circuits face local non-linearity in temperature curves due to manufacturing process and simulation environment complexities, leading to inaccurate temperature detection.
Innovation Solution
A temperature-sensing circuit employing a modified binary-search method, which dynamically adjusts the pre-search voltage range, includes a search-control circuit, voltage-reference circuit, CTAT circuit, DAC circuit, comparison circuit, and SAR control circuit to improve temperature detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional temperature-sensing circuit is used, then the circuit can detect operating temperature, but the detection accuracy deteriorates due to local non-linearity in temperature curves
Solution Approach 1:
The temperature detection range is divided into multiple temperature segments, with each segment having its own dedicated search voltage range. This segmentation allows the circuit to handle local non-linearity in different temperature regions independently, improving overall measurement precision by adapting to the specific characteristics of each segment.
Solution Approach 2:
The search voltage range is dynamically adjusted based on the detected temperature segment. The circuit automatically selects appropriate search voltages from a plurality of candidate voltages, enabling the temperature-sensing circuit to adapt to varying temperature conditions and maintain high detection accuracy across the entire operating range.
2Adaptability or versatility
If the temperature detection range is expanded, then the circuit can cover more operating conditions, but the detection precision deteriorates due to fixed search voltage range
Solution Approach 1:
The circuit employs a dynamic search voltage range that automatically adjusts according to the detected temperature segment. This allows the circuit to maintain optimal detection precision across a wide temperature range by selecting appropriate search voltages from multiple candidates, rather than using a fixed voltage range.
Solution Approach 2:
The circuit changes the search voltage parameter based on the temperature segment being detected. By having a plurality of candidate search voltages and selecting the appropriate ones for different temperature segments, the circuit maintains high measurement precision while expanding its adaptability to various operating conditions.
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 modified binary-search method enhances the accuracy of temperature detection by dynamically adjusting the temperature segments, effectively addressing the local non-linearity issues in temperature curves.
Implementation Method 1
a CTAT (complementary to absolute temperature) circuit, a digital-to-analog converter (DAC) circuit
Data Source
AI summary
A temperature-sensing circuit is provided, which includes: a search-control circuit, a voltage-reference circuit, a CTAT (complementary to absolute temperature) circuit, a digital-to-analog converter (DAC) circuit, a comparison circuit, and an SAR (successive approximation register) circuit. The search-control circuit generates a reference-voltage selection signal according to a plurality of control signals. The voltage-reference circuit selects a first reference voltage from a plurality of candidate reference voltages according to the reference-voltage selection signal, and provides a second reference voltage. The CTAT circuit converts the second reference voltage into a first comparison voltage. The DAC circuit converts the first reference voltage into a second comparison voltage. The comparison circuit compares the first comparison voltage and the second comparison voltage to generate a comparison-result signal. The SAR control circuit outputs each bit of a temperature-segment signal of an operating temperature according to the comparison-result signal. The control signals include the temperature-segment signal.