Agilent 5991-3470EN Simplifying Complex Benchtop Measurements with USB Switches - Application Note c20140917 free download

File name 5991-3470EN Simplifying Complex Benchtop Measurements with USB Switches - Application Note c20140917

Keysight Technologies Simplifying Complex Benchtop Measurements with USB Switches Application Note Introduction Switches and switch matrices are widely used for the routing of RF and microwave signals in high-speed ATE systems. As today's devices and products become more complex, there is an increasing need for the speed and flexibility of switching systems capable of connecting multiple signals or instruments to multiple devices under test (DUTs). On a smaller scale, the same is true in R&D and design validation when developing such products or when creating test routines that will be used later in manufacturing. Even on the bench or in a small system, dependable switching can improve efficiency and save time. For day-to-day testing, the Keysight Technologies, Inc. U1810B USB coaxial switch combines excellent RF perfor- mance with the convenience of USB connectivity. Operating from DC to 18 GHz, this single-pole/double-throw (SPDT) unit connects directly to the inputs of instruments such as network analyzers and spectrum analyzers using a rugged Type-N connector. The plug-and-play USB connection provides power and the control interface. A simple push button provides manual control, a soft front panel enables more advanced control from the screen of a PC, and programmatic control is supported using C++, LabVIEW, Keysight VEE, and more. This application note provides a brief overview of switching topologies before outlining three measurement scenarios that include the U1810B USB switch. The end of the note provides pointers to related information about the U1810B and the instruments used in the scenarios. 2 Comparing Switch Topologies Utilizing a Convenient Alternative Several factors are important in the selection of an appropriate switch The Keysight U1810B USB coaxial switch provides a unique combina- for a specific application: frequency range, switching speed, settling tion of excellent RF performance and the convenience of USB con- time, power handling and operating life are near the top of the list. nectivity in a small package. Operating from DC to 18 GHz, this SPDT Additional considerations include electrical characteristics such as device is configured to route signals between one common port and a insertion loss, return loss, repeatability, isolation, voltage standing- pair of switched ports. The unit connects directly to instruments such wave ratio (VSWR) and termination. as network analyzers and spectrum analyzers using a rugged Type-N connector; the switched ports use female SMA connectors (Figure 2). Less obvious is the effect of switc