Logic Analyzer Probing Techniques for High-Speed Digital Systems
Validation of digital systems has and always will be a vital piece of the product development cycle. As speeds increase, it is becoming more and more important to incorporate testing ability into the initial design. With printed circuit board (PCB) speeds starting to enter into the Gb/s era, it is becoming increasingly challenging to make the target system operate, let alone consider the electrical parasitics of testability. This paper discusses the impact of adding logic analysis testability to PCBs. In addition, techniques are presented to successfully probe digital systems to minimize the effect on the user’s system, while ensuring the logic analyzer still has enough signal integrity to operate. Finally, examples of today’s logic analyzer probing solutions are presented and the advantages and disadvantages of each solution are discussed.
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