Shared ESD Clamp Topology for Multi-Supply Area Reduction
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Solution Overview
Problem
Traditional electronic systems with multiple power supply sources face challenges in reducing the area occupied by electrostatic discharge (ESD) clamps, which is essential for cost reduction and device miniaturization, as each supply typically requires its own clamp, leading to increased size and cost.
Innovation Solution
Implementing a single ESD clamp that can be shared among multiple power supplies, with a voltage clamp configuration allowing a low voltage supply to connect at a halfway point to satisfy its lower requirements, and using diodes to couple the supplies to a common voltage reference node, thereby reducing the number of clamps needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each power supply uses its own ESD clamp, then ESD protection reliability is improved, but the area occupied by clamps increases
Solution Approach 1:
The patent merges multiple ESD clamps into a single shared clamp structure that protects multiple power supply pins simultaneously. The clamp is configured with multiple input nodes that can be connected to different voltage supplies through coupling diodes, allowing one physical clamp to serve multiple protection functions that traditionally required separate clamps for each supply pin.
Solution Approach 2:
The ESD clamp is designed with universal functionality to handle electrostatic discharge events from multiple different voltage supplies. By incorporating multiple input nodes and supporting connection to various supply voltages through diodes, the single clamp structure achieves multi-functionality, replacing what would traditionally require multiple specialized clamps for different supply pins.
2Area of stationary object
If a single ESD clamp is shared among multiple supplies, then clamp area is reduced, but circuit complexity increases
Solution Approach 1:
Coupling diodes are introduced as intermediary elements between the power supply pins and the shared ESD clamp. These diodes simplify the connection architecture by providing automatic voltage level adaptation and isolation, allowing the single clamp to interface with multiple different voltage supplies without requiring complex control logic or switching mechanisms.
Solution Approach 2:
The circuit utilizes parameter changes in diode behavior (forward voltage drop characteristics) to automatically adapt to different supply voltages. When different voltage supplies are connected through the coupling diodes to the shared clamp, the diodes' electrical parameters naturally adjust based on the applied voltage, enabling the clamp to operate effectively across multiple voltage levels without complex regulation circuitry.
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 significantly reduces the area occupied by ESD clamps, allowing for a compact design while maintaining effective ESD protection, with a potential N times reduction in clamp area based on the number of supplies, thus lowering costs and enhancing device miniaturization.
Implementation Method 1
Electrostatic discharge (ESD) clamps occupy a significant area of an integrated circuit (IC)
Implementation Method 2
a first coupling diode coupled between an input node of a first voltage supply and a first input node of a voltage clamp of the supply circuit
Data Source
AI summary
Aspects and embodiments disclosed herein include a supply circuit for a radio frequency system comprising a first coupling diode coupled between an input node of a first voltage supply and a first input node of a voltage clamp of the supply circuit, an output of the first coupling diode being coupled to the first input node of the voltage clamp, and a second coupling diode coupled between an input node of a second voltage supply and the first input node of the voltage clamp, an output of the second coupling diode being coupled to the input node of the voltage clamp.