FPGA Root Monitoring With Distributed Satellite ADCs

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Solution Overview

Problem

Conventional systems for monitoring operating conditions of programmable logic devices require expensive metal-layer routing resources and limit scalability due to the need for central analog-to-digital conversion of signals from distributed sensors, which are susceptible to noise and interference.

Innovation Solution

A monitoring system with satellite monitors distributed throughout the device to convert analog signals from sensors into digital data locally, reducing the need for metal-layer routing and enhancing scalability, using a network interconnect system to route digital data to a root monitor for analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If central analog-to-digital conversion is used for sensor signals, then signal processing can be centralized, but metal-layer routing resources are required and scalability is limited

Engineering Contradiction:

Improverouting resource complexityVSAvoidscalability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent divides the monitoring system into distributed satellite monitors throughout the device, each performing local analog-to-digital conversion. This segmentation eliminates the need for centralized metal-layer routing of analog signals and allows independent scaling of monitoring capacity by adding more satellite monitors without requiring additional expensive routing resources.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a two-dimensional metal-layer routing architecture to a three-dimensional distributed architecture utilizing the network interconnect system. By routing digital data through the network interconnect rather than metal layers, the system adds a new dimensional pathway for signal transmission, eliminating routing resource constraints.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If distributed satellite monitors with local ADCs are used, then scalability is enhanced and metal-layer routing is eliminated, but device complexity increases

Engineering Contradiction:

ImprovescalabilityVSAvoidmonitoring system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The satellite monitors are designed as universal building blocks that can be distributed throughout the device in various configurations. Each satellite monitor performs the same core function of local analog-to-digital conversion, allowing the system to scale uniformly by adding identical units rather than designing increasingly complex centralized systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent replaces the physical metal-layer routing infrastructure with a logical network interconnect system. By substituting the physical routing mechanism with a digital network protocol-based system, the patent eliminates the constraint of limited metal layers while maintaining systematic organization through standardized communication interfaces.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If analog signals are routed over long distances to central conversion, then signal quality degrades due to noise and interference, but routing infrastructure is simplified

Engineering Contradiction:

Improvesignal qualityVSAvoidrouting infrastructure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent performs analog-to-digital conversion at the source location before the signals need to be transmitted over long distances. By converting analog signals to digital form locally at each satellite monitor, the system eliminates the problem of analog signal degradation during transmission, as digital signals are inherently more resistant to noise and interference.

Inventive Principle:

Principle #10Preliminary action

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

This approach reduces costs and increases scalability by eliminating the need for metal-layer routing resources and allowing for more efficient data collection and analysis of sensor data, while minimizing signal degradation.

Implementation Method 1

The root monitor may include a bandgap reference circuit that compensates the reference voltage for temperature variations

Methodology Applied

Scientific EffectTemperature compensation:

Data Source

PatentUS11709275B2Root monitoring on an FPGA using satellite ADCs

Publication Date: 2023.07.25 XILINX INC

AI summary

Systems and methods for monitoring a number of operating conditions of a programmable device are disclosed. In some implementations, the system may include a root monitor including circuitry configured to generate a reference voltage, a plurality of sensors and satellite monitors distributed across the programmable device, and a interconnect system coupled to the root monitor and to each of the plurality of satellite monitors. Each of the satellite monitors may be in a vicinity of and coupled to a corresponding one of the plurality of sensors via a local interconnect. The interconnect system may include one or more analog channels configured to distribute the reference voltage to each of the plurality of satellite monitors, and may include one or more digital channels configured to selectively route digital data from each of the plurality of satellite monitors to the root monitor as data packets.