PCB Signal Identification via Embedded Test Identifiers
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Solution Overview
Problem
In high-speed electrical lab validation, identifying signals on printed circuit boards (PCBs) is challenging due to the difficulty in distinguishing between numerous pins in Ball Grid Arrays (BGAs) and connectors, especially when the PCBs are oriented differently than in their CAD designs, and silkscreen identifiers may be obscured or unavailable.
Innovation Solution
An integrated circuit with a test signal generator and signal identification logic embeds an identifier into a test signal transmitted to a test point on the PCB, which is then received by a signal-identifying controller that decodes the identifier to display the signal identity, using a test probe and a list of signal identities for decoding encoded values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silkscreen identifiers are used on PCB surfaces to label signals, then signal identification is straightforward, but space is consumed and identifiers may be obscured by components or heat sinks
Solution Approach 1:
The patent introduces an intermediary system consisting of a probe, controller, and display device that mediates between the test point and the signal identification process. The probe detects electrical characteristics at the test point, the controller processes this data to identify the signal, and the display presents the signal name to the user, eliminating the need for physical silkscreen labels on the PCB surface.
Solution Approach 2:
The patent replaces the mechanical/visual system of silkscreen printing identifiers on the PCB with an electronic detection and display system. Instead of relying on visual mechanical labels that consume space and can be obscured, the system uses electrical signal detection through the probe, digital processing by the controller, and electronic display to identify signals, thereby substituting a mechanical labeling system with an electronic identification system.
2Area of stationary object
If numerous pins in BGAs and connectors are densely packed to reduce PCB size, then PCB area is reduced, but pin identification becomes difficult
Solution Approach 1:
The patent implements a feedback mechanism where the controller receives detection data from the probe, compares it against stored reference data, and provides feedback in the form of identified signal names displayed to the user. This feedback loop allows the user to confidently identify pins even in densely packed BGAs and connectors, as the system actively provides confirmation of pin identity based on electrical characteristics rather than relying solely on visual inspection of crowded pin layouts.
3Ease of operation
If the PCB is reoriented or flipped for better access during testing, then test accessibility is improved, but signal identification becomes more difficult
Solution Approach 1:
The patent enables the system to identify signals autonomously without requiring the user to visually locate and read silkscreen identifiers. The probe automatically detects electrical characteristics at the test point, the controller independently processes this data to identify the signal, and the display presents the signal name. This self-service capability allows the PCB to be freely reoriented or flipped for optimal test access while the system continues to accurately identify signals based on their electrical properties rather than their visual label positions.
Data Source
AI summary
Apparatus and methods for identifying a signal on a printed circuit board (PCB) under test, including an integrated circuit mounted on the PCB, the integrated circuit having a test signal generator that transmits a test signal to an output pin of the integrated circuit, with the output pin connected to a test point on the PCB; the integrated circuit also having signal identification logic that inserts into the test signal, an identifier of the signal; a test probe in contact with the test point; and a signal-identifying controller that receives the test signal and the identifier from the test probe and displays, in dependence upon the identifier, the identity of the signal.