Semiconductor Integrated Circuit Voltage Noise Compensation
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Solution Overview
Problem
Semiconductor integrated circuits face challenges in reducing sharp voltage noise due to sharp current changes, which existing techniques such as series regulators, capacitors, and current control methods struggle to address effectively, leading to potential malfunctions.
Innovation Solution
Incorporating a voltage comparison circuit that compares the detected electric source voltage with a reference voltage set lower than the standard stabilization voltage, and a control circuit that compensates voltage drops by adjusting the resistance value of a variable resistance to rapidly raise the voltage when it falls below the reference, thereby reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a constant voltage is supplied to suppress electric power consumption, then power consumption is reduced, but voltage noise increases due to sharp current changes
Solution Approach 1:
The control circuit proactively detects voltage drops using a voltage comparison circuit before they cause malfunction, and immediately compensates by increasing output from the electric source generation circuit. This preliminary detection and compensation action prevents the harmful voltage noise from occurring in the first place, while maintaining constant voltage operation for low power consumption.
2Stability of the object's composition
If external DC/DC converter is used for voltage stabilization, then voltage stability is improved, but response speed to sharp current changes is insufficient
Solution Approach 1:
The voltage stabilization function is segmented into two parts: the external DC/DC converter handles general voltage stabilization, while an internal control circuit with voltage comparison circuit handles rapid compensation for sharp current changes. This segmentation allows each part to optimize its performance - the external converter provides stable baseline voltage while the internal circuit responds quickly to transient changes.
Solution Approach 2:
The control circuit acts as an intermediary between the external DC/DC converter and the load. It detects voltage drops that the external converter misses due to slow response, and immediately compensates by adjusting the internal electric source generation circuit, thereby bridging the response speed gap.
3Measurement precision
If wiring resistance is present in feedback path, then voltage detection accuracy is improved, but feedback voltage stability deteriorates
Solution Approach 1:
A resistance element is introduced as an intermediary in the feedback path. This resistance element divides the feedback voltage, and the control circuit compares the divided voltage with a reference voltage. This intermediary approach allows accurate detection of the actual load voltage (including the effect of wiring resistance) while the control circuit compensates for the instability caused by the resistance division.
Data Source
AI summary
A semiconductor integrated circuit includes a voltage comparison circuit and a control circuit. The voltage comparison circuit compares a detection voltage with a reference voltage. The detection voltage is a detected result of an electric source voltage supplied from an electric source supply device supplying the electric source voltage. The reference voltage is set to be lower than a standard voltage used in stabilization control that the electric source supply device performs for stabilizing the electric source voltage. The control circuit performs control of compensating a voltage drop of the electric source voltage when the detection voltage is lower than the reference voltage based on a result of comparison by the voltage comparison circuit.