Sense-Line IR Drop Compensation for Multi-Voltage Power Rails
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Solution Overview
Problem
High-power multi-voltage systems experience significant IR drop due to parasitic resistances, which can affect transistor operation speed and cause performance failures, especially in critical chip paths, necessitating effective compensation methods.
Innovation Solution
A system comprising a power supply or regulator connected to a target block with a ground line and a power line, featuring switches and a sense line for monitoring and compensating IR drop, along with a control circuit to manage switch states and maintain target power line voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power delivery is increased to meet high-power system demands, then power supply capability is improved, but IR drop increases due to parasitic resistances
Solution Approach 1:
The patent implements a feedback mechanism where a sense line monitors the voltage at the target block, and the power supply regulator adjusts its output based on this feedback to compensate for IR drop. The sense line connects the power supply regulator to the target block through separate parasitic resistances, allowing the system to detect voltage drops and adjust accordingly, resolving the contradiction between high power delivery and IR drop losses.
2Measurement precision
If sense line is connected directly to power supply regulator output, then IR drop compensation precision is improved, but power supply stability deteriorates due to load effects
Solution Approach 1:
The patent segments the power delivery path by introducing a sense line that is electrically separate from the main power line. The sense line contains its own parasitic resistances (R_sense1, R_sense2) that are distinct from the power line resistances (R_pow1, R_pow2). This segmentation allows precise sensing of target block voltage without the sense line being affected by load variations on the power line, thus maintaining both measurement precision and power supply stability.
3Adaptability or versatility
If multiple switches are added for mode switching, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by using the same sense line and parasitic resistances for both active mode IR drop compensation and inactive mode power-off detection. The sense line serves dual purposes: monitoring voltage during operation and detecting power-off states when switches are open. This universal design provides operational flexibility across different modes while minimizing additional complexity compared to separate circuits for each function.
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
The solution effectively compensates for IR drop in active and inactive modes, ensuring stable power delivery and preventing performance degradation by maintaining voltage levels, thus enhancing system operation and integrity.
Implementation Method 1
IR drop refers to the electrical potential difference between the two ends of a conducting line during a current flow. The voltage drop across a line with a resistance value is the product of current (I) passing through resistance and resistance value (R).
Data Source
AI summary
A system may include a power supply or regulator connected to a target block with a ground line and a power line, a first switch in the power line, a sense line connected between the power supply for the regulator and a sense point on the power line at the target block side of the first switch, a second switch in the sense line, a third switch connected between the power line at the target block side of the first switch and the ground line, and a control circuit for generating a control signals to the first switch, the second switch, and the third switch.