RF3928
Bias Instruction for RF3928 Evaluation Board
ESD Sensitive Material. Please use proper ESD precautions when handling devices of evaluation board. Evaluation board
requires additional external fan cooling. Connect all supplies before powering evaluation board.
1. Connect RF cables at RFIN and RFOUT.
2. Connect ground to the ground supply terminal, and ensure that both the VG and VD grounds are also connected to this
ground terminal.
3. Apply -6V to VG.
4. Apply 50V to VD.
5. Increase VG until drain current reaches 440mA or desired bias point.
6. Turn on the RF input.
IMPORTANT NOTE: Depletion mode device, when biasing the device VG must be applied BEFORE VD. When removing bias VD
must be removed BEFORE VG is removed. Failure to follow sequencing will cause the device to fail.
NOTE: For optimal RF performance, consistent and optimal heat removal from the base of the package is required. A thin layer
of thermal grease should be applied to the interface between the base of the package and the equipment chassis. It is recom-
mended a small amount of thermal grease is applied to the underside of the device package. Even application and removal of
excess thermal grease can be achieved by spreading the thermal grease using a razor blade. The package should then be
bolted to the chassis and input and output leads soldered to the circuit board.
Vg
Vd
RFIN
RFOUT
RF3928
2.8 – 3.4GHz
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
8 of 11
DS120508
RFMD [ RF MICRO DEVICES ]
