Satellite ADC Monitoring with Local Reference Calibration
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Solution Overview
Problem
As programmable logic devices increase in size and complexity, accurately monitoring operating conditions such as temperature and voltage across their circuits becomes increasingly challenging, especially due to the need for precise reference voltages and extensive metal-layer routing resources, which are costly and limit scalability.
Innovation Solution
The implementation of a monitoring system with a root monitor and satellite monitors that use a bandgap voltage generator for accurate temperature-independent reference voltages, local voltage sources for satellite monitors, and a network-on-chip interconnect system to route digital data, eliminating the need for extensive metal-layer routing and allowing for local analog-to-digital conversions near sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized monitoring system with extensive metal-layer routing is used to monitor operating conditions across the programmable device, then comprehensive monitoring coverage is achieved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The monitoring system is segmented into multiple independent satellite monitors distributed across the programmable device, each responsible for a specific region. This eliminates the need for extensive centralized metal-layer routing while maintaining comprehensive monitoring coverage through localized measurement points.
Solution Approach 2:
The system transitions from a two-dimensional metal-layer routing architecture to a three-dimensional monitoring structure by embedding satellite monitors within the device fabric itself, utilizing vertical integration and local interconnects rather than relying on planar metal routing layers.
2Measurement precision
If accurate temperature-independent reference voltages are generated using a bandgap voltage generator, then measurement precision is improved, but the device complexity and area requirements increase
Solution Approach 1:
The bandgap voltage generator is segmented and distributed to multiple satellite monitors through the analog channels, allowing each monitor to generate its own accurate reference voltage locally. This eliminates the need for a single complex centralized reference generator while maintaining measurement precision across all monitoring points.
Solution Approach 2:
The analog channels serve as intermediaries that distribute the reference voltage from the bandgap generator to multiple satellite monitors, enabling accurate measurements throughout the device without requiring each monitor to contain a complete reference voltage generation circuit.
3Adaptability or versatility
If local voltage sources are used in satellite monitors to generate reference voltages, then device scalability is improved, but the measurement precision may deteriorate due to voltage variations
Solution Approach 1:
The system implements periodic calibration operations where the bandgap voltage generator periodically updates reference codes that are distributed to satellite monitors. This periodic recalibration compensates for voltage variations and maintains measurement precision while allowing the use of scalable local voltage sources.
Solution Approach 2:
The calibration circuit in each satellite monitor uses feedback from the bandgap voltage generator to adjust and correct its local reference voltage measurements. This feedback mechanism ensures that even with local voltage sources, the measurement precision is maintained through continuous correction based on the master reference.
4Device complexity
If analog signals are routed over long distances to a centralized monitor, then device complexity is reduced, but signal integrity and measurement accuracy deteriorate
Solution Approach 1:
The monitoring function is segmented and distributed to satellite monitors located near the sensors, eliminating long-distance analog signal routing. Each satellite monitor performs local analog-to-digital conversion, preserving signal integrity while simplifying the overall routing structure through localized processing.
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 enhances the accuracy and scalability of thermal and voltage monitoring, reduces costs by minimizing the use of metal-layer resources, and allows for more efficient data collection and analysis of operating conditions across the programmable device.
Implementation Method 1
The root monitor may include a bandgap voltage generator configured to generate a temperature-independent reference voltage
Implementation Method 2
The ADC may be configured to convert the analog signals generated by the one or more associated sensors into digital codes indicative of the measured operating conditions
Data Source
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 network-on-chip (NoC) 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.