Adaptive Slew-Rate Control Circuit for Balanced Signal Transitions
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Solution Overview
Problem
Voltage fluctuations during signal transmission in electronic circuits lead to increased power consumption and signal quality issues, particularly due to wide slew rate ranges and imbalanced transitions between signal levels.
Innovation Solution
A slew-rate control circuit that adjusts signal levels based on numerical relationships between signal transitions, using proportional calculation and logic operations to ensure the slew rate falls within a preset range, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal output circuit outputs multiple signals with wide slew rate range, then the transmission quality is improved, but the power consumption increases and the transmission time increases
Solution Approach 1:
The patent applies dynamics by making the signal inversion decision adaptive rather than static. The output adjustment circuit dynamically determines whether to invert signals based on real-time transition balance detection, allowing the system to optimize slew rate control adaptively for each signaling event while maintaining power efficiency and transmission quality
Solution Approach 2:
The patent changes the inversion state parameter of signals to control slew rate. By inverting or non-inverting signals based on transition balance detection, the system adjusts signal characteristics to maintain slew rate within optimal ranges, thereby reducing power consumption while preserving transmission quality
2Speed
If the number of signals transitioning from high to low level is significantly different from the number of signals transitioning from low to high level, then the slew rate range becomes wider, but the power consumption increases
Solution Approach 1:
The patent implements feedback through the transition balance detection mechanism. The circuit detects the balance between high-to-low and low-to-high transitions, and based on this detection, the output adjustment circuit provides feedback control by selectively inverting signals to maintain transition balance, thereby controlling slew rate range while minimizing power consumption
Solution Approach 2:
The patent addresses asymmetry in signal transitions by detecting imbalanced transition counts and applying selective inversion to restore balance. When transition asymmetry is detected, the system applies asymmetric inversion to specific signal groups to rebalance the transitions, optimizing slew rate control and power efficiency
3Speed
If an excessively high slew rate is used, then the signal transmission speed is improved, but overshoot and undershoot occur increasing power consumption
Solution Approach 1:
The patent applies preliminary action by detecting signal transition patterns before output and pre-determining the inversion state of signals. The transition balance detection circuit analyzes upcoming transitions and the output adjustment circuit pre-adjusts signal inversion to ensure slew rate remains within optimal ranges, preventing overshoot and undershoot before they occur
Data Source
AI summary
A slew-rate control circuit, including: a proportional calculation circuit, which generates a first indicating voltage according to a plurality of adjusted first signals within a previous preset period and a plurality of first signals within a current preset period, and generates a second indicating voltage according to the plurality of adjusted first signals within the previous preset period and a plurality of second signals that are inverted from the plurality of first signals within the current preset period; a logic operation circuit, which generates an operation result according to a relationship between the first indicating voltage, and first and second reference voltages, and a relationship between the second indicating voltage, and the first and second reference voltages; and an output adjustment circuit, which determines whether to invert the multiple first signals within the current preset period according to the operation result.