RF Probing

RF Probing

Challenge

As RF products become more integrated, RF connectors are rarely available to measure the output or impedance of a specific device or section of the circuit board directly. It is a common practice that coaxial cables are soldered on the board to gain access to the suspect circuit. The risk of using this approach is that the cable could peel off the copper traces or pads the circuit board and hence damage the DUT. Furthermore, it is difficult to de-embed the test cable and its solder joint.

Useful Links

  • RF Design web site offers many useful tips of designing RF and microwave circuits.
  • Selected Topics in RF Coplanar Probing link
  • A step by step guide to practical RF device measurement - MOS-AK link
  • RF Probing with Keysight VNA link
  • Probing planarization with Mylar tape link

Good Practices

It is important to plan ahead to add test points for different functional blocks in the schematics design and board layout phases. Additional 0402 or 0201 components may be incorporated, so that they can be removed to isolate the suspect circuit, if necessary.

  1. Use non-contact high-frequency probes, such as Agilent RF probes, whenever it is possible.
  2. Use a 50 ohm contact probe and calibrate the probe at its tips with a calibration substrate to remove the test probe characteristics when accurate s-parameter measurements are required.

 

RF Probing Demonstrations

RF Probing Demonstration

RF Fixture Probing with S-Probes and TP250s

 RF Probing Demonstration 

RF Antenna Probing with S-Probe and TP250

 RF Probing Demonstration 

RF Module Probing with S-Probes and TP250s

 RF Probing Demonstration 

Non-contact probing with Keysight RF probe and FP160 positioner

About PacketMicro

PacketMicro, based in Silicon Valley, provides a wide range of gigahertz probes, probe positioners, bench-top probe stations, and digital microscopes. In addition, PacketMicro offers wireless modules and engineering services in Bluetooth Smart, ZigBee, and wireless sensor networks. PacketMicro customers include many Fortune 100 companies.

Get in touch

PacketMicro, Inc.
1900 Wyatt Drive, Suite 9
Santa Clara, CA 95054
USA

+1 408 675 3900 (Main)

+1 408 580 0059

info@packetmicro.com