Roos Instruments is a company based in Santa Clara, CA that designs and manufactures Automatic Test Equipment (ATE) for the semiconductor industry.

Founded in 1989 from a DARPA Small Business Innovation Research (SBIR) grant, the company specializes in mixed-signal, microwave and millimeter wave test of precision consumer and industrial-grade integrated circuits.

Still in use today, the RI7100 tests analog and RF ICs such as low noise amplifiers, mixers, tuners, and transceiver subsystems for consumer products and military applications.

Cassini test systems provide the ATE industry's widest measurement range, spanning from DC and high-speed digital to over 110 GHz.

The configurable instrument architecture combined with a unique graphical programming environment enables flexible application design and expansion, rapid test development, and high-performance measurement capability.