HDMI Receiver ESD Protection via Dynamic Termination Control
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Solution Overview
Problem
Household multimedia devices with HDMI ports are prone to damage from electrostatic discharge (ESD) due to frequent plugging and unplugging, leading to potential permanent internal circuit damage, and existing ESD protection solutions are costly and have limited tolerance.
Innovation Solution
A method for ESD protection in receivers, involving a detection circuit that controls termination resistors to prevent ESD by determining the connection status through voltage levels, ensuring resistors are only coupled when the connection is complete, thereby diverting electrostatic charges away from sensitive circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional ESD protection circuit is utilized, then ESD tolerance is enhanced, but cost increases and ESD tolerance is limited by component specifications
Solution Approach 1:
The patent applies preliminary action by detecting the connection status before ESD can occur. The detection circuit checks whether the HDMI cable is properly connected, and only then enables the termination resistors to be coupled to the receiving terminals. This preventive approach activates protection measures in advance, before electrostatic discharge can damage the internal circuits, thereby enhancing ESD tolerance without requiring complex dedicated protection circuits throughout the device.
2Reliability
If termination resistors are always coupled to receiving terminals, then ESD protection is provided, but power consumption increases and connection issues arise
Solution Approach 1:
The patent applies dynamics by making the coupling between termination resistors and receiving terminals conditional rather than static. The switch circuit dynamically controls the connection state based on detection results from the detection circuit. When no cable is detected or connection is unstable, the termination resistors remain uncoupled, saving power and avoiding signal interference. When a valid connection is detected, the resistors are coupled to provide ESD protection, thus adapting the protection level to actual operational needs.
Data Source
AI summary
A method for electrostatic discharge protection in a receiver and associated receiver are provided. The receiver includes a reference voltage terminal, a detection terminal, at least one set of receiving terminals and at least one set of termination resistors. The method includes: according to a voltage level of the detection terminal, generating a detection result; and according to the detection result, controlling whether to configure said at least one set of termination resistors to be respectively coupled between said at least one set of receiving terminals and the reference voltage terminal.