RFUSB Test Solution Providers and Conformance Tests
Advertisement
This page provides an overview of USB test solution providers and the equipment/software they offer for USB conformance testing.
Introduction to USB
The Universal Serial Bus (USB) interface, similar in concept to RS232, facilitates peer-to-peer communication between a host and a peripheral device. Several USB versions exist, including USB 2.0, USB 3.0, USB 3.1 Gen1/Gen2, USB 3.2, and USB 4.0.
The following table summarizes key features of various USB versions:
| USB versions | Features |
|---|---|
| USB 2.0 | Data Rate: 480 Mbps, Power Output: 2.5W |
| USB 3.0 | Data Rate: 4800 Mbps (4.8 Gbps), Power Output: 4.5W (Gen1) |
| USB 3.1 Gen1 | Data Rate: 5 Gbps, Power Output: 4.5W (Gen1) |
| USB 3.1 Gen2 | Data Rate: 10 Gbps, Power Output: 100W (Gen2) |
| USB 3.2 | Data Rate: 5/10/20 Gbps, Power Output: Up to 100W |
| USB 4.0 | Data Rate: 40 Gbps (Max.), Power Output: Up to 100 Watts |
USB Conformance Tests
The USB interface supports different data transfer speeds, namely Low speed, Full speed, and High speed. USB-IF electrical test specifications define specific tests based on these speeds.
The following sections detail the USB transmitter and receiver tests. The diagram below illustrates a typical USB test setup:
Transmitter Tests
These tests require a high-speed oscilloscope with sufficient bandwidth. Typical transmitter tests include:
- Data rate test
- Eye Diagrams and Spectrum mask tests
- Rise and Fall time
- Monotonic data transitions over vertical openings
- Output voltage when either D+ or D- is driven high
- Output voltage when either D+ or D- is not being driven
- Differential output impedance
Receiver Tests
Receiver tests utilize a compatible generator capable of producing specific test signals with defined amplitudes into the USB Device Under Test (DUT). These tests include:
- Data rate test
- Compliance as per different masks
- Reliably receive data in the presence of common mode (CM) voltage
- Implementation of transmission envelope detector (ED) with desired receiver tests
USB Test Solution Vendors
The following table lists some popular USB test solution vendors:
| Vendors | Description |
|---|---|
| Eurofins Digital Testing | Helps evaluate products against conformance specifications. Offers tools, test automation, and test lab services for software and hardware development. Provides USB Testing services. eurofins-digitaltesting.com |
| Keysight Technologies | Develops test and measurement software applications and test equipment for wired and wireless standards. N5416A is a USB 2.0 compliance test software for Infiniium oscilloscopes (4 or 4+16 channels). Simplifies USB signal integrity testing and auto-configures the oscilloscope for each test. keysight.com |
| GRANITE RIVER LABS INC. (GRL) | GRL-USB-PD-C2 test platform supports conformance testing of USB Type-C Power Delivery (PD) 3.0 and 2.0. Supports USB PD protocol analyzer and sniffer modes. Can be used as an integrated PHY test controller for ThunderBolt 3, DisplayPort, and HDMI Alt mode testing. Generates test reports in various formats (pdf, csv, xml) automatically. graniteriverlabs.com |
| Rohde & Schwarz | Offers USB PD conformance testing in collaboration with Granite River Labs. Uses R&S oscilloscopes (R&S ® RTE or RTO) with GRL-USB-PD analysis software from Granite River Labs. The software controls test equipment and assists in electrical/protocol tests. rohde-schwarz.com |
| Tektronix, Inc. | Offers compliance and debugging solutions for USB 4.0, Thunderbolt 4.0, and DisplayPort 2.0. tek.com |
| BitifEye Germany | Develops AWGs, Oscilloscopes, BERTs, and network analyzers for PHY layer conformance tests for digital interfaces like USB, PCIe, HDMI, MIPI, Thunderbolt, etc. Products are compatible with Keysight Technologies and other manufacturers. Supports USB versions such as USB 2.0, USB 3.0, USB 3.1 Gen1/Gen2/Type-C. bitifeye.com |
