Output Driver Circuit with Voltage-Referenced Drive Strength Adjustment
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Solution Overview
Problem
Conventional output driver circuits experience degraded output characteristics due to changes in power supply voltage, leading to variations in slew rate, which affect the driving strength and quality of output data.
Innovation Solution
An output driver circuit is designed with a driving control signal generation block that compares the power supply voltage to a reference voltage, generating control signals to adjust the driving strengths of pull-up and pull-down signals, ensuring consistent driving forces regardless of power supply voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power supply voltage level varies, then the driving strength changes, but the slew rate becomes unstable and output characteristics degrade
Solution Approach 1:
The patent implements a feedback mechanism by comparing the actual power supply voltage level with a reference voltage level. Based on this comparison, the circuit automatically adjusts the driving strength of the output driver to compensate for voltage variations, thereby maintaining stable slew rate and output characteristics despite changes in power supply voltage.
Solution Approach 2:
The patent changes the driving strength parameter dynamically based on the detected power supply voltage level. By adjusting the driving strength in response to voltage variations, the circuit maintains consistent output characteristics and slew rate across different operating conditions.
2Reliability
If the driving strength is increased to maintain output quality, then the output characteristics improve, but the circuit complexity increases
Solution Approach 1:
The patent employs dynamic adjustment of driving strength rather than a fixed complex circuit design. The driving strength is adaptively changed based on real-time voltage level detection, allowing the circuit to maintain high output quality while avoiding the need for overly complex static circuit structures.
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
This solution maintains consistent output data characteristics by adjusting driving strengths based on power supply voltage levels, minimizing slew rate changes and preventing degradation of output data quality.
Implementation Method 1
a driving control signal generation block configured to compare a power supply voltage and a reference voltage and generate first and second driving control signals
Data Source
AI summary
An output driver circuit includes a driving control signal generation block configured to compare a power supply voltage and a reference voltage and generate first and second driving control signals and first and second inverted driving control signals; a preliminary driving block configured to drive a pull-up driving signal and a pull-down driving signal with driving strengths set according to the first and second driving control signals and the first and second inverted driving control signals; and a driving block configured to drive output data in response to the pull-up driving signal and the pull-down driving signal.