FPGA Load-Cell Modulation for Power Delivery Network Testing
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Solution Overview
Problem
Designing a reliable power delivery system for Field Programmable Gate Arrays (FPGAs) is challenging due to unpredictable maximum power consumption and the dynamic nature of FPGA register transfer level (RTL) payloads, making it difficult to accurately assess power delivery quality and identify performance issues.
Innovation Solution
A testing system that adjusts load current amplitude and frequency by modulating the activation of load cells within the FPGA, using a control logic block to generate an activation modulation signal defining a duty cycle, allowing for precise control of current draw and impedance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional power delivery testing methods are used, then the testing process is simple, but the measurement precision of power delivery quality is insufficient
Solution Approach 1:
The testing system segments the power delivery network into multiple measurement points including voltage taps, current sense resistors, and impedance measurement circuits. This segmentation enables precise measurement of voltage, current, and impedance at different locations within the power delivery network, directly improving measurement precision while distributing system complexity across modular components.
Solution Approach 2:
The patent introduces intermediary measurement elements such as current sense resistors placed in series with power delivery paths and voltage taps connected to power nodes. These intermediaries enable accurate measurement of electrical parameters without significantly loading the circuit, resolving the contradiction between measurement precision and system complexity by adding controlled measurement infrastructure.
2Reliability
If dynamic load conditions are tested, then the reliability of power delivery assessment improves, but the difficulty of detecting and measuring increases
Solution Approach 1:
The testing system continuously monitors voltage and current across the power delivery network during dynamic load transitions. The control circuit maintains continuous measurement and adjustment capability, enabling reliable assessment of power delivery under varying load conditions while managing measurement complexity through sustained operational monitoring rather than discrete snapshot measurements.
Solution Approach 2:
The patent implements dynamic measurement capability that adapts to changing load conditions. The system measures voltage, current, and impedance across multiple frequency ranges and load states, with the control circuit adjusting measurement parameters based on detected operating conditions. This dynamic approach improves reliability by capturing real-world variability while managing measurement difficulty through adaptive control.
3Productivity
If impedance profiling across multiple frequency ranges is performed, then the productivity of power system debugging improves, but the device complexity increases
Solution Approach 1:
The testing system employs a universal impedance measurement circuit capable of operating across multiple frequency ranges (e.g., 20 Hz to 20 MHz) using the same basic circuit topology. The control circuit configures the measurement system for different frequency ranges as needed, enabling comprehensive impedance profiling and debugging productivity improvement without requiring separate dedicated circuits for each frequency range, thus managing device complexity through multi-functional design.
Data Source
AI summary
Systems and apparatus for an integrated test tool for that utilizes reconfigurable hardware to assess power delivery quality. In one aspect, a method includes receiving, at a control logic block in a field programmable gate array (FPGA), a load current amplitude value and a load current frequency value; determining, by the control logic block, an activation modulation signal that causes each of a plurality of load cells to which it is applied to be in an active state for a first period of time and in an inactive state during a second period of time, and a first of number of load cells that when activated according to the activation modulation signal cause the FPGA to draw a load current at the load current amplitude.