Internal Voltage Regulator Level Shifting for Supply Variation
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Solution Overview
Problem
Existing internal voltage generation circuits in electronic devices face challenges in adjusting drivability based on power supply voltage, particularly in maintaining suitable voltage levels and drivability as the power supply voltage fluctuates.
Innovation Solution
The internal voltage generation circuit includes a shifting source voltage generation circuit and an internal voltage regulator that generate and adjust voltages through level shifting operations, ensuring drivability by generating a shifting source voltage that decreases as the power supply voltage rises below a preset level and maintains a constant level when it exceeds this threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply voltage fluctuates, then the internal voltage levels may become unsuitable, but maintaining fixed voltage levels reduces adaptability to voltage variations
Solution Approach 1:
The patent implements dynamic voltage adjustment by making the reference voltage variable based on the power supply voltage level. When the power supply voltage is below a threshold, the reference voltage is set to a first level; when above the threshold, it switches to a second level. This dynamic adaptation allows the internal voltage regulator to maintain reliable output voltages across varying power supply conditions, resolving the contradiction between stability and adaptability.
Solution Approach 2:
The patent changes the parameter of reference voltage based on the power supply voltage level. By switching between different reference voltage levels (first reference voltage level and second reference voltage level) according to whether the power supply voltage is below or above a threshold, the system adapts its operating parameters to maintain reliable internal voltage generation under varying conditions.
2Reliability
If the shifting source voltage is adjusted to maintain drivability, then voltage level control is improved, but the circuit complexity increases
Solution Approach 1:
The patent introduces a shifting source voltage generation circuit as an intermediary component between the power supply voltage input and the internal voltage regulator. This circuit generates a shifting source voltage based on the power supply voltage level and feeds it to the regulator, enabling drivability maintenance without requiring complex adjustments throughout the entire voltage generation system.
Solution Approach 2:
The patent segments the voltage generation system into distinct functional blocks: a shifting source voltage generation circuit that handles voltage level adjustment based on power supply conditions, and an internal voltage regulator that maintains stable output. This segmentation allows each block to perform its specific function with simpler circuitry, reducing overall system complexity while maintaining reliability.
Data Source
AI summary
An internal voltage generation circuit includes a shifting source voltage generation circuit configured to generate a shifting source voltage having a voltage level that falls as a voltage level of a power supply voltage rises during a period when the power supply voltage is lower than a preset voltage level. The internal voltage generation circuit also includes an internal voltage regulator configured to generate a driving signal through a level shifting operation that is performed according to the shifting source voltage received when driving an internal voltage and configured to drive the internal voltage based on the driving signal.