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USB Design Solutions

Electrical Validation

The increase in bit rate afforded by the high-speed data rate extensions of USB 2.0 opens up a whole new range of USB consumer applications to make the PC a more user friendly and valuable tool in workplace and home. USB applications range from wallet sized portable hard disk drives to full motion video. With any consumer product opportunity, time to market is crucial. USB designers are keenly aware that the correct tool aids in meeting schedule objectives.

With the advantages of the new 480 Mb/s data rate comes a variety of design challenges to vendors of USB 2.0 compliant devices.

 

Issues of signal quality now come to the forefront of design concerns, where in the past, USB 1.0 was considered more forgiving. The digital designer must now be concerned with board layout. At the new data rate, line length and proper layout of differential trace pairs is critical for the electrical signal to arrive at its destination intact. Add jitter, rise and fall times, EMI, noise, ground bounce, and ground loops to layout concerns and you have identified the lion share of signal quality issues that the design engineer must wrestle to the ground. Maintenance of Signal Quality is one of the keys to ensure that your USB 2.0 device is compliant and will be awarded the USB 2.0 certified logo.

View and Debug Failing Signal Quality

Tektronix offers several oscilloscopes suitable for USB Signal Quality analysis and troubleshooting.

The DPO7000 and DPO/DSA70000 Series are the new generation of real-time digital phosphor oscilloscopes and are the industry’s best solution to the challenging signal integrity issues faced by designers verifying, characterizing, debugging and testing.

The DPO7000 Series oscilloscopes provide the right performance for your USB 2.0 measurements. With up to 3.5 GHz bandwidth, 4 channels and up to 40 GS/s sample rate, the DPO7000 is ideally suited to perform the most accurate rise time, fall time and monotonicity tests found in HS Signal Quality requirements.