Integrated Resistor for EMC Filtering in Chip Supply
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Solution Overview
Problem
Conventional solutions for ensuring electromagnetic compatibility (EMC) in integrated circuits are costly, prone to errors, and difficult to implement, especially in space-constrained environments, and cause dropout voltage issues at low supply voltages.
Innovation Solution
Incorporating a high-value resistor (greater than 5 ohms) directly coupled to the supply voltage terminal, with an optional buffer capacitor, either internal or external, to decouple overvoltages and sustain chip functionality during disturbances like micro breaks and ESD pulses without additional blocking capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external RC components are used to filter disturbances, then electromagnetic compatibility is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the filtering function with the existing supply voltage terminal structure by integrating a resistor directly into the terminal configuration. This eliminates the need for separate external RC filtering components while maintaining disturbance filtering capability, thereby reducing device complexity and cost without compromising electromagnetic compatibility.
Solution Approach 2:
The supply voltage terminal itself is configured to provide filtering functionality through the integrated resistor. The terminal structure serves dual purposes: providing power connection and filtering disturbances, eliminating the need for additional dedicated filtering components and simplifying the overall device architecture.
2Reliability
If rectifying diodes and storing capacitors are used, then electromagnetic compatibility is improved, but supply voltage flexibility deteriorates due to dropout voltage
Solution Approach 1:
The patent changes the key parameter from using diodes with fixed dropout voltage characteristics to using a resistor with adjustable resistance value. This allows the filtering solution to adapt to different supply voltage levels without being constrained by the 0.6V minimum dropout voltage of diode-based solutions, thereby maintaining supply voltage flexibility while ensuring electromagnetic compatibility.
3Reliability
If external filtering components are added, then disturbance filtering is improved, but space requirements increase
Solution Approach 1:
The filtering function is merged into the supply voltage terminal structure itself through the integrated resistor. This eliminates the need for separate external filtering components that would occupy additional space, thereby maintaining effective disturbance filtering while minimizing space requirements in compact device layouts.
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 configuration effectively decouples overvoltages from active circuitry, reduces the risk of ESD protection device destruction, and maintains chip functionality during supply voltage disturbances, including micro breaks and low ohmic negative voltage peaks, without the need for external filtering components.
Implementation Method 1
A first terminal of the resistor is coupled with the terminal of the chip... effectively decouples overvoltages from active circuitry
Implementation Method 2
an internal capacitor coupled to a second terminal of the resistor... maintains chip functionality during supply voltage disturbances
Data Source
AI summary
A device includes a chip and integrated circuit. Devices and integrated circuits are provided where a resistor is coupled to a terminal of a chip or integrated circuit.