On-Die Line Driver Impedance Calibration Using Overshoot Detection
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Solution Overview
Problem
Integrated circuit devices face challenges in minimizing parasitic characteristics of on-die interconnects, leading to excessive power consumption, signal propagation delay, and impedance mismatching issues, which compromise signal integrity and reliability, especially with increasing chip scale integration and signal rate.
Innovation Solution
An integrated circuit device with a calibration module that adjusts the supply voltage of line drivers to match impedance with on-die interconnects, using a voltage comparator and calibration control unit to detect voltage overshoots and adjust power supply accordingly, thereby reducing power consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeaters are inserted along the interconnect to reduce parasitic characteristics, then signal quality is improved, but power consumption increases excessively
Solution Approach 1:
The patent extracts the impedance matching function from the signal transmission path by providing a separate calibration module that independently adjusts the output impedance of line drivers. This removes the need for repeaters in the main signal path, eliminating their power consumption while maintaining signal quality through dedicated impedance calibration.
Solution Approach 2:
The patent introduces a calibration module as an intermediary between the line driver and the interconnect. This calibration module measures signal characteristics and adjusts driver output impedance accordingly, serving as a mediator that optimizes signal transmission without requiring power-consuming repeaters along the interconnect path.
2Reliability
If repeaters are inserted along the interconnect to reduce parasitic characteristics, then signal quality is improved, but signal propagation delay increases
Solution Approach 1:
The patent removes repeaters from the signal transmission path and replaces their impedance matching function with a calibration module that adjusts driver output impedance. This extraction eliminates the propagation delay introduced by repeaters while maintaining signal quality through impedance optimization.
3Reliability
If repeaters are inserted along the interconnect to reduce parasitic characteristics, then signal quality is improved, but occupied die area increases
Solution Approach 1:
The patent extracts the impedance matching functionality from multiple distributed repeaters and consolidates it into a single calibration module. This consolidation significantly reduces the occupied die area while maintaining signal quality through centralized impedance optimization.
4Reliability
If strict impedance matching is implemented during design, then signal integrity is improved, but manufacturing complexity increases due to process variations
Solution Approach 1:
The patent implements dynamic impedance calibration that adjusts driver output impedance based on measured signal characteristics. This dynamic approach compensates for manufacturing process variations and environmental changes, achieving signal integrity without requiring strict fixed impedance matching during manufacturing.
Solution Approach 2:
The patent employs feedback mechanisms where the calibration module measures signal characteristics and uses this information to adjust driver output impedance. This closed-loop feedback system automatically compensates for manufacturing variations, achieving signal integrity without increasing manufacturing complexity.
5Ease of manufacture
If impedance tolerance is increased to accommodate process variations, then manufacturing ease is improved, but system performance degrades
Solution Approach 1:
The patent implements dynamic impedance calibration that adjusts driver output impedance based on measured signal characteristics. This allows the system to tolerate wider impedance variations during manufacturing while maintaining high performance through runtime optimization, effectively decoupling manufacturing ease from system performance.
Solution Approach 2:
The patent changes the operating parameters of line drivers dynamically through calibration, adjusting output impedance to match actual interconnect characteristics. This parameter adjustment enables the system to achieve high performance despite manufacturing tolerances, effectively resolving the trade-off between ease of manufacture and system performance.
6Productivity
If higher operating speed is implemented to meet performance requirements, then productivity is improved, but power consumption increases
Solution Approach 1:
The patent optimizes driver output impedance parameters through calibration to match interconnect characteristics. This optimization reduces signal reflections and improves transmission efficiency, allowing higher operating speeds with reduced power consumption by minimizing energy loss in the interconnect.
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 effectively alleviates excessive power consumption and noise while maintaining signal integrity by adaptively matching impedance between line drivers and interconnects, improving the reliability and performance of integrated circuit systems.
Implementation Method 1
a voltage comparator arranged to compare the received indication of an output signal to a reference signal to detect a voltage overshoot of the output signal
Implementation Method 2
calibrate an impedance of at least one on-die interconnect line driver in order to match an impedance between the at least one on-die interconnect line driver and at least one on-die interconnect
Data Source
AI summary
An integrated circuit device comprising at least one calibration module for calibrating an impedance of at least one on-die interconnect line driver in order to adaptively match an impedance between the at least one on-die interconnect line driver and at least one on-die interconnect line conjugated thereto. The at least one calibration module is arranged to receive an indication of an output signal of the at least one line driver, compare the received indication of an output signal to a reference signal and detect a presence or an absence of a voltage overshoot of the output signal of the at least one line driver, and upon detection of a presence or an absence of a voltage overshoot of the output signal of the at least one line driver, cause the adjustment of power supply of the at least one line driver, to be decreased or increased correspondingly.