On-Die Power Rail Measurements: Setup and Best Practices
Accurate on-die power rail measurements depend on proper sense-line design, differential probing, and careful test setup at the package level.
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Power-Rail Noise: Small Signal, Big DC Offset
Accurate power-rail noise measurement requires handling tiny signals on large DC offsets, best achieved with active probes and proper impedance management.
Understand RF Pickup When Measuring Power Rails
RF pickup can introduce misleading noise into power-rail measurements, but proper shielding and coaxial connections can dramatically reduce interference and reveal true signal behavior.
Introduction to Channel Equalization
Channel equalization uses transmitter and receiver techniques to counteract losses, reduce ISI, and improve signal quality in high-speed data links.
The Effects of De-Emphasis on Eye Diagrams
Transmit de-emphasis enhances eye diagrams by reducing inter-symbol interference, improving signal clarity at the cost of lower overall amplitude.
Continuous Time Linear Equalization
Continuous Time Linear Equalization (CTLE) enhances high-speed serial signals by compensating for channel loss, improving eye openings while balancing noise performance.
Serial-Data Channel Emulation and S Parameters
S-parameters allow engineers to model, remove, or simulate channel effects in high-speed serial links, helping diagnose signal degradation and improve performance.
A Walk-Through of Ground-Bounce Measurements
This practical walkthrough shows how to measure and diagnose ground bounce using oscilloscope techniques, quiet-low sense lines, and controlled I/O switching scenarios.
Ground Bounce Explained: Causes and How to Measure It
Ground bounce occurs when simultaneous switching currents flow through shared inductance in IC packages, creating voltage noise that can lead to digital bit errors.
Using Quiet-Low I/O Drivers to Measure Ground Bounce
Quiet-low and quiet-high I/O drivers can act as on-die sense lines, helping engineers observe and analyze ground bounce in digital systems.
The Causes of Ground Bounce and How To Avoid It
Ground bounce occurs when multiple switching signals share a high-inductance return path, creating voltage noise that can disrupt digital I/O performance.
Reading S-parameters: Broad Dips
Broad dips in S-parameter plots typically result from stub resonances, where reflected signals interfere with the main signal path and reduce transmission at specific frequencies.
Reading S-parameters: Monotonic Drop Offs
A monotonic drop-off in S21 indicates increasing signal attenuation with frequency, typically caused by dielectric and conductor losses in the interconnect.