Radar Signal Analysis With Oscilloscope Demodulation
Learn how oscilloscope demodulation and FFTs reveal radar pulse envelopes, Barker-coded phase modulation, chirp behavior, and frequency content.
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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.
Reading S-Parameters: Understanding Ripple Patterns
Ripple patterns in S-parameters are caused by reflections from impedance discontinuities, with ripple spacing determined by interconnect length and ripple magnitude driven by impedance mismatch.
Reading S-parameters: Sharp Dips
Sharp dips in S-parameter plots often indicate coupling to high-Q resonant structures, where specific frequencies are absorbed by PCB cavities or floating interconnects.