Plasma Damage Protection Device Bipolar Charge Dissipation
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Solution Overview
Problem
Conventional plasma damage protection methods, such as using a bipolar transistor, do not effectively protect against both positive and negative polarized charges in semiconductor manufacturing processes, leading to inadequate protection against plasma damage in integrated circuits.
Innovation Solution
A plasma damage protection device comprising a switch component and a transmission structure, where the switch component is coupled between a reference power rail and a pad, and the transmission structure transmits charges to the switch component during the back-end-of-line process, turning it on to dissipate excessive charges and prevent damage to protected components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bipolar transistor is used for plasma damage protection, then protection against both positive and negative polarity charges is achieved, but the protection performance is insufficient and reliability is not adequately improved
Solution Approach 1:
The protection device is segmented into multiple functional components: a transmission structure (first conductor) that selectively transmits charges of specific polarity to the switch component, and a switch component (second transistor) that actively dissipates charges. This segmentation allows each component to specialize in handling specific charge types, improving overall protection performance compared to using a single bipolar transistor for both polarities.
Solution Approach 2:
The transmission structure acts as an intermediary between the pad and the switch component. It selectively couples charges of a first polarity from the pad to the control end of the switch component, while isolating charges of opposite polarity. This intermediary mechanism enables precise control over which charges trigger the protection response, enhancing protection effectiveness.
2Device complexity
If conventional diode protection is used, then the structure is simple, but protection is limited to unipolar charges only
Solution Approach 1:
The protection device achieves multi-functionality by combining a transmission structure with polarity-selective coupling characteristics and a switch component. This combination enables the device to handle both positive and negative polarity charges effectively, transforming a previously unipolar protection approach into a bipolar protection solution without excessive complexity increase.
3Ease of manufacture
If charges are not dissipated during back-end-of-line process, then manufacturing process is simpler, but plasma charges accumulate and damage circuit components
Solution Approach 1:
The transmission structure and switch component are configured in advance during manufacturing to automatically detect and respond to charge accumulation on the pad. The transmission structure is pre-configured to couple charges of a specific polarity to the switch component, which is pre-biased to remain off during normal operation but activates automatically when charges accumulate, dissipating them before they can damage protected components.
Solution Approach 2:
The protection device operates autonomously by utilizing the charge accumulation itself as the trigger signal. When charges accumulate on the pad, the transmission structure automatically couples these charges to the control end of the switch component, which then self-activates to dissipate the charges through a discharge path, eliminating the need for external control circuits or additional monitoring mechanisms.
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 solution effectively dissipates accumulated plasma charges of any polarity, enhancing protection performance and maintaining the reliability of integrated circuits by providing bipolar protection during the manufacturing process.
Implementation Method 1
the transmission structure transmits the charge on the pad to a control end of the switch component
Implementation Method 2
the charge on the pad is dissipated by turning on the switch component, accordingly preventing components in the integrated circuit from damage by the accumulated charge
Data Source
AI summary
Disclosed are a plasma damage protection device and a plasma damage protection method. The plasma damage protection device is disposed in an integrated circuit. The plasma damage protection device includes a switch component and a transmission structure. The switch component is coupled between a reference power rail and a pad. The switch component is turned on or cut off according to a charge on the pad. The pad is coupled to a protected component. The transmission structure is configured to transmit the charge on the pad to a control end of the switch component during a back-end-of-line process. The switch component is turned on according to the charge on the pad during the back-end-of-line process.