ESD Circuit Voltage Gap Layout for High-Voltage Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ESD protection circuits manufactured using low-voltage processes fail to operate effectively under high-voltage conditions, leading to potential breakdown and malfunction of transistors due to voltage mismatch.
Innovation Solution
An ESD protection circuit incorporating resistors, capacitors, transistors, and voltage gap providers, which provide controlled voltage drops to ensure low-voltage components operate within their safe operating area, while directing ESD currents away from the protected circuit during high-voltage events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low-voltage process components are used in the ESD protection circuit, then manufacturing cost and ease of manufacture are improved, but the circuit cannot operate under high-voltage conditions and components break down
Solution Approach 1:
The patent introduces voltage gap providers as intermediary elements between the high-voltage ESD path and the low-voltage transistors. These voltage gap providers (comprised of series-connected diodes or voltage drop structures) absorb the voltage difference, allowing low-voltage transistors to safely operate in a high-voltage ESD protection circuit by mediating the voltage transition and protecting the sensitive low-voltage components from breakdown
Solution Approach 2:
The patent applies different voltage rating characteristics to different parts of the circuit. The ESD protection path (voltage pad to ground) is designed to handle high voltages through the voltage gap providers and ESD transistors, while the core low-voltage transistors operate at safe voltage levels. This local differentiation of voltage handling capabilities allows the circuit to simultaneously support both high-voltage ESD events and low-voltage normal operation
2Adaptability or versatility
If the ESD protection circuit is designed for high-voltage operation, then voltage compatibility is improved, but manufacturing complexity and cost increase due to requiring high-voltage process components
Solution Approach 1:
The voltage gap providers serve as intermediary structures that enable high-voltage operation without requiring all circuit components to be high-voltage rated. By placing these voltage-dropping elements in series with the ESD path, the circuit achieves high-voltage compatibility while the majority of the circuit (the low-voltage transistors) can remain simple and manufactured using standard low-voltage processes
Solution Approach 2:
The ESD protection circuit is segmented into distinct functional zones: a high-voltage handling section (voltage gap providers and ESD transistors) and a low-voltage control section (core transistors). This segmentation allows each section to be optimized independently - the high-voltage section handles voltage compatibility while the low-voltage section maintains manufacturing simplicity
3Ease of manufacture
If low-voltage transistors are used in the ESD protection circuit, then ease of manufacture is improved, but reliability under high-voltage conditions deteriorates due to transistor breakdown
Solution Approach 1:
The voltage gap providers are positioned beforehand in the ESD protection path to absorb excess voltage before it reaches the low-voltage transistors. During normal operation and ESD events, these pre-positioned voltage-dropping elements ensure that the voltage at the transistor gates and drains remains within safe limits, cushioning the transistors from voltage spikes that would otherwise cause breakdown and improve reliability
Solution Approach 2:
The voltage gap providers act as protective intermediaries between the high-voltage ESD environment and the sensitive low-voltage transistors. By mediating the voltage interaction, they allow the transistors to operate reliably in what would otherwise be a hostile high-voltage environment, maintaining reliability without sacrificing manufacturing ease
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
The circuit effectively protects low-voltage components from breakdown during high-voltage operations by maintaining safe operating conditions and diverting ESD currents, ensuring reliable circuit functionality.
Implementation Method 1
a first voltage gap provider coupled between a second terminal of the first P-type transistor and a first terminal of the first N-type transistor, and configured to provide a first voltage drop from the second terminal of the first P-type transistor to the first terminal of the first N-type transistor
Implementation Method 2
When an electrostatic discharging event with a positive voltage polarity occurs, the second terminal of the resistor is at the system voltage, the first P-type transistor and the second N-type transistor are turned on, the first N-type transistor is turned off, and an ESD current flows from the voltage pad to the second N-type transistor through the second voltage gap provider
Data Source
AI summary
An electrostatic discharge circuit includes a resistor, a capacitor, a first P-type transistor, a first N-type transistor, a first voltage gap provider, a second N-type transistor, and a second voltage gap provider. The resistor and the capacitor coupled in series between the voltage pad and the system voltage. The first P-type transistor, the first voltage gap provider, and the first N-type transistor are coupled in series between the voltage pad and the system voltage with control terminals of the transistors coupled between the resistor and the capacitor. The first voltage gap provider provides a voltage drop between the first P-type transistor and the first N-type transistor. The second voltage gap provider and the second N-type transistor are coupled in series between the voltage pad and the system voltage with a control terminal of the transistor coupled between the first voltage gap provider and the first N-type transistor.