Mismatch Detection Circuit for Semiconductor Temperature Sensors
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Solution Overview
Problem
Semiconductor processing is plagued by process mismatches, such as variations in transistor threshold voltage and source-drain conductance due to discrepancies in oxide film thickness or ion-doped concentrations, leading to malfunctioning temperature sensors.
Innovation Solution
A mismatch detection and correction circuit (MDCC) is integrated into semiconductor devices to detect and correct threshold voltage and source-drain conductance mismatches by adjusting bias voltages and recovery currents, ensuring accurate temperature sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro-fabrication process continues, then manufacturing precision deteriorates due to process mismatch, but productivity is improved
Solution Approach 1:
The patent applies preliminary action by measuring and storing transistor parameters (threshold voltage, conductance) during the fabrication process before the mismatch becomes critical. The system proactively captures process data and pre-calculates compensation values, allowing correction to be applied later without reworking the transistors. This enables high-volume manufacturing while maintaining precision through advance preparation.
Solution Approach 2:
The patent implements parameter changes by adjusting bias voltages and operating conditions of transistors to compensate for process mismatches. The system dynamically modifies electrical parameters (gate-source voltage, drain-source voltage) based on measured transistor characteristics, transforming the approach from physical rework to electrical compensation. This allows post-fabrication tuning to achieve desired performance despite manufacturing variations.
2Reliability
If process mismatch occurs, then reliability of temperature sensor deteriorates, but manufacturing precision cannot be improved without increasing complexity
Solution Approach 1:
The patent applies universality by designing a calibration system that serves multiple functions: it characterizes transistor parameters, stores process data, calculates compensation values, and applies corrections. The same infrastructure supports different transistor types and various sensor applications. This multi-functional approach improves reliability without proportionally increasing complexity, as one system handles multiple correction tasks.
Solution Approach 2:
The patent introduces an intermediary calibration circuit that mediates between the mismatched transistors and the temperature sensing function. This intermediate layer measures actual transistor parameters and generates compensation signals that bridge the gap between imperfect hardware and required performance. The intermediary absorbs the complexity of mismatch correction while presenting a simple, reliable interface for temperature measurement.
3Ease of manufacture
If oxide film thickness or ion-doped concentration varies, then manufacturing precision worsens, but ease of manufacture is improved with standard processes
Solution Approach 1:
The patent implements self-service by enabling the manufacturing system to automatically measure, characterize, and compensate for its own process variations. The calibration circuit uses the actual transistors from the production line to generate correction data, eliminating the need for separate precision measurement equipment or manual adjustment. The system serves itself by using production parts to calibrate production parts, maintaining ease of manufacture while improving precision through automated feedback.
Data Source
AI summary
A semiconductor device includes: an integrated circuit (IC) including an internal circuit; and a mismatch detection and correction circuit connected to the internal circuit of the IC, the mismatch detection and correction circuit configured to detect a process mismatch and correct an error in the internal circuit caused by the process mismatch using a current difference between a first current and a second current based on a charged voltage of a capacitor.