The Tektronix automotive Ethernet test solution provides automated compliance support for BroadR-Reach V3.2 specifications and IEEE P802.3bwTM(100BASE-T1) requirements. The automated compliance solution includes test software that runs on a Tektronix Oscilloscope while performing all physical layer (PHY) transmitter compliance tests.
The compliance software allows for complete or selective testing of any of the transmitter electrical specifications including complete Oscilloscope control of the required setups. Software setup flexibility allows for design validation, margin analysis and repeatable compliance testing while reducing instrument setup difficulties. Additionally, the software can generate a comprehensive date-stamped test report with pass/fail results including Oscilloscope display waveforms and data plots.
Full compliance testing requires configuring the PHY device into special test modes along with selection of the corresponding compliance test(s). The Tektronix compliance software allows selection of all or any of the specific tests through a simple setup menu. Software navigation is arranged around a logical workflow for quick setups, changes and review of test results.
Test setup configurations will vary from connections to the device under test, probing, test fixtures, calibration and use of the Oscilloscope and signal generator. To aid the users, the Tektronix software provides reference illustrations that help ensure the correct setup for each test.
Tektronix offers a full range of instruments and accessories with technical performance ideally suited for complete transmitter PHY transceiver testing including:
MSO/DPO5000B, DPO7000C, or MSO/DPO 70000C/DX Oscilloscope (1 GHz or greater bandwidth required) with Option BRR compliance software
TDP1500 differential probe
AWG5000C or AFG3000C signal generator for Distortion and Return Loss tests
TF-GBE-BTP and TF-BRR-CFD test fixtures
Unique to Tektronix is the ability to perform the required Return Loss measurement with an Oscilloscope using a patented technique without needing a more specialize RF instrument. For optimized use, a PC monitor can be connected or even used with Remote Desktop Connection.
The PHY is configured using Test Mode 1. The droop measurements are performed by determining the positive and negative waveform peaks voltages and measuring the voltage 500ns after the peak value where the magnitude of droop should be less than 45%.
The Spectral of an input signal (set to Test Mode 5) is computed using built-in scope MATH functions. Post processing is done on the signal to arrive at the PSD. The computed PSD is then compared with the specification - lower and upper masks to arrive at the final result.
Configured for Test Mode 4 the distortion test measures the maximum allowable transmitter distortion. This test requires the use of a disturbing sine wave signal that is added to the PHY output signal. The peak transmitter distortion is calculated where measure values are compared against the compliance test specification.
The MDI return loss test determines if there is an impedance mismatch from the differential impedance specification of 100 Ω that will affect interoperability. This test can be performed using a VNA, but the Tektronix solution is capable of performing this test with an Oscilloscope using a patented measurement approach eliminating the need for additional test instruments.
Compliance documentation is quick and easy with a summary report in MHTML or PDF format. The report provides Pass/Fail status and is automatically generated after tests are completed. The report includes test configuration details, waveform plots, Oscilloscope displays, and margin analysis to provide more insights into your design.
Accurate and repeatable compliance testing requires access to the PHY transmitter output, reference clock and must support calibration and use of disturbing signals. One recommended approach is to use Tektronix TF-GBE-BTP Ethernet fixture and TF-BRR-CFD clock divider fixture that can support all test setups while providing convenient test points for probing.
Development of automotive electronics capable of supporting higher data rates like automotive Ethernet along with other communication buses like CAN, FlexRay and LIN requires an Oscilloscope that offers a full suite of debug and analysis capabilities. The Tektronix Windows Oscilloscopes offer a range of performance models tailored for mixed signal electronics along with a comprehensive set of features that include:
For even greater insight into your automotive Ethernet design, advanced analysis tools like DPOJET can quickly allow extended jitter and timing analysis. In the screen display below DPOJET was able to characterize the 66.667 MHz PHY symbol clock including Rj histogram analysis.
Requires Oscilloscope with 1 GHz minimum bandwidth
Supported: P6247 or P6248 (70000 series Oscilloscope requires TCA-BNC adapters, 7000 and 5000 seriesOscilloscope require TPA-BNC adapters)
External PC monitor and USB keyboard
2 pair SMA cables or coaxial cables for use with AFG or AWG
2 coaxial cables for use with clock divider outputs and 1 SMA cable for clock divider input
1 coaxial cable for AFG or AWG for marker output