User`s guide

1-69
Making Measurements
Measuring Amplifiers
High Power Configuration Two
Figure 1-54 shows a full 2-port forward direction high power measurement. In this
configuration the maximum power from test PORT 1 and test PORT 2 is 0.10 watt or
20 dBm.
NOTE This is only an example configuration for high power applications. Actual
device values need to be determined for each individual application.
Figure 1-54 High Power Configuration Two
An external amplifier and coupler are connected between the RF OUT and the RF IN
access ports to the transfer switch.
The coupled arm of the external coupler must be connected to the R CHANNEL IN port.
Maximum recommended power to the R CHANNEL input is −10 dBm, so depending on the
coupling factor of the external coupler, an attenuator may need to be added to the R
CHANNEL path.
Maximum power to the RF IN port is 26 dBm. With the PORT 1 or PORT 2
SWITCH/COUPLER ports connected, the approximate loss from RF IN to either test
PORT is 6 dB at 3 GHz, and 8 dB at 6 GHz. The approximate loss for the Option 075 is
8 dB at 3 GHz.
Maximum power to PORT 2 from the DUT is 2 watts or 33 dBm. Attenuators need to be
added to the A and B sampler ports to reduce the power to the samplers. An isolator was
added to the PORT 2 SWITCH/COUPLER ports to reduce power to the transfer switch.
Maximum power to the transfer switch is 26 dBm. Some compression may occur above
−123 dBm.
NOTE Isolators must be inserted so that maximum isolation is achieved from the
COUPLER to the SWITCH ports. Refer to the isolators’ manufacturer
specifications for more information.