Semiconductor Power Supply Path Segmentation for Noise Isolation
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Solution Overview
Problem
Conventional semiconductor devices experience noise reflections in internal power supply voltages due to shared input terminals for power supply and ground voltages, leading to unstable operations and potential malfunctions.
Innovation Solution
The semiconductor device employs separate input terminals and power supply paths for receiving and generating power supply and ground voltages, isolating noise effects on the internal power supply voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate input terminals and power supply paths are used for internal circuit and power circuit, then noise reflection is reduced and internal power supply voltage stability is improved, but device complexity increases
Solution Approach 1:
The power supply system is segmented into two independent paths: one path (first power supply path) supplies the internal circuit, and another path (second power supply path) supplies the power circuit that generates internal power supply voltage. This segmentation prevents noise from the internal circuit from affecting the power supply voltage generation, thereby improving reliability while maintaining manageable complexity through functional separation.
Solution Approach 2:
The power circuit that generates internal power supply voltage is extracted from the general input terminals and assigned to dedicated second power input terminals. This extraction isolates the sensitive voltage generation function from noise generated by the internal circuit operations, resolving the contradiction by prioritizing reliability through functional isolation.
2Device complexity
If internal circuit and power supply voltage generator share common input terminals, then device complexity is reduced, but noise reflection occurs causing internal power supply voltage to fluctuate
Solution Approach 1:
The common power supply structure is segmented into separate input terminals: first power input terminals for the internal circuit and second power input terminals for the power circuit. This segmentation eliminates the noise reflection problem that occurs with shared terminals while keeping the overall device complexity manageable through systematic separation of functions.
Solution Approach 2:
Separate input terminals act as intermediaries that isolate the internal circuit from the power supply voltage generation process. By introducing these dedicated terminals, noise from the internal circuit cannot directly affect the voltage generation, thereby improving reliability without significantly increasing structural complexity.
Data Source
AI summary
A semiconductor device includes an internal circuit configured to receive a first power supply voltage applied via a first power input terminal through a first power supply path and receive an internal power supply voltage to perform a predetermined circuit operation and an internal power supply voltage generator configured to receive a second power supply voltage for a power circuit applied via a second power input terminal through a second power supply path and generate the internal power supply voltage, wherein the second power supply path is separated from the first power supply path.