Integrated Temperature Sensor for Memory Voltage Compensation
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Solution Overview
Problem
Integrated circuits, particularly memory devices, experience performance variations due to temperature fluctuations, necessitating the need for temperature-sensitive circuitry to adjust operating voltages and improve operational stability.
Innovation Solution
Incorporation of a temperature sensing component on integrated circuits that generates reference voltages with different temperature coefficients, utilizing a detector circuit to convert these references into a digital signal for temperature indication, and applying this information to adjust voltage biases in peripheral circuits and memory arrays to compensate for temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensing components are added to integrated circuits, then temperature compensation capability is improved, but device complexity increases
Solution Approach 1:
The temperature sensor is integrated directly into the memory device, combining temperature sensing functionality with the memory circuitry. The sensor shares the same substrate and process steps, merging what would traditionally be separate components into a unified device structure.
Solution Approach 2:
The temperature sensor serves multiple functions: it provides temperature information for compensation, enables adaptive voltage adjustment, and supports process variation calibration. This multi-functionality reduces the need for additional dedicated components.
2Measurement precision
If multiple reference circuits with different temperature coefficients are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Different reference circuits are designed with specific local characteristics - some with positive temperature coefficients and others with negative coefficients. Each reference circuit is optimized for its specific temperature compensation role, allowing precise temperature measurement through their combined output.
Solution Approach 2:
The reference circuits are designed to produce outputs with different temperature dependencies by varying parameters such as transistor sizing, resistor ratios, and bias currents. This allows the system to extract temperature information from the differential behavior of these references.
3Manufacturing precision
If process variation independent functions are implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The temperature sensor output is fed back to the memory device to dynamically adjust operating parameters. This feedback mechanism allows the system to compensate for process variations by adapting its operation based on actual temperature and calibrated reference measurements.
Solution Approach 2:
The temperature sensor and reference circuits are designed to automatically compensate for their own process variations through self-calibration mechanisms. The system uses its internal references to establish baseline behavior and automatically adjusts for manufacturing tolerances without requiring external calibration equipment.
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 provides accurate temperature compensation, reducing performance variations across a range of temperatures, thereby enhancing the stability and efficiency of memory operations.
Implementation Method 1
a reference circuit that generates a first reference voltage with a first non-zero temperature coefficient and a second reference voltage with a second temperature coefficient having a different magnitude than the first non-zero temperature coefficient
Implementation Method 2
a circuit to pre-charge a capacitive node, and then discharge a voltage on the node, with a constant current
Implementation Method 3
The oscillator can be a relaxation oscillator that alternately charges a capacitive node to a third reference having the second temperature coefficient, and discharges the capacitive node using a clock current having a magnitude proportional to the constant current
Data Source
AI summary
An integrated circuit includes a memory and peripheral circuits with a temperature sensor used to automatically adjust operating voltages. The temperature sensor includes a reference circuit that generates a first reference with a first non-zero temperature coefficient and a second reference with a second temperature coefficient having a different magnitude than the first non-zero temperature coefficient. A detector circuit on the integrated circuit, having temperature and process variation compensation, converts a difference between the first and second references into a digital signal indicating temperature on the integrated circuit.