Reference Voltage Calibration Circuit for Real-Time PVT Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing calibration circuits for integrated circuits, such as DRAM, struggle to achieve accurate resistance calibration due to variations in process, voltage, and temperature (PVT), leading to inaccuracies in impedance calibration over time.
Innovation Solution
A calibration circuit comprising a calibration resistance module, a reference voltage generation module, and a comparison module, which adjusts impedance in real-time based on PVT changes by comparing output voltage with a generated reference voltage, ensuring accurate calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed periodically or in response to calibration commands, then the calibration circuit can maintain basic functionality, but accurate calibration requirements cannot be met due to PVT variations
Solution Approach 1:
The patent implements a feedback mechanism where the calibration circuit continuously monitors PVT parameters and automatically adjusts resistance values in real-time. The calibration resistance module receives control signals based on detected PVT variations and dynamically modifies its impedance to compensate for these changes, ensuring continuous calibration accuracy without requiring periodic manual calibration commands.
Solution Approach 2:
The calibration circuit transitions from a static calibration approach (periodic or command-based) to a dynamic real-time calibration system. The calibration resistance module is designed to continuously adapt its resistance values in response to real-time PVT variations, enabling the circuit to maintain accurate calibration under changing operating conditions without interruption to normal operation.
2Measurement precision
If real-time calibration is implemented to address PVT variations, then calibration accuracy is improved, but circuit complexity increases
Solution Approach 1:
The calibration circuit is divided into functionally independent modules: a calibration resistance module for impedance adjustment, a PVT detection module for parameter monitoring, and a control module for generating adjustment signals. This segmentation allows each module to perform its specific function efficiently while reducing overall circuit complexity through modular design, enabling real-time calibration without requiring a completely complex redesign.
Data Source
AI summary
The present disclosure provides a calibration circuit, a memory, and a calibration method. The calibration circuit includes: a calibration resistance module, wherein an output voltage of the calibration resistance module varies with a first parameter, and the first parameter includes at least one of a fabrication process of the calibration circuit, a power supply voltage of the calibration circuit, or an operating temperature of the calibration circuit; a reference voltage generation module, configured to receive a first comparison signal, to generate a corresponding reference voltage; and a comparison module, coupled to the calibration resistance module and the reference voltage generation module, and configured to compare the output voltage with the reference voltage and generate the first comparison signal.