A34-A37 65-Db Source Step Attenuators And A38-A41 Bias Tees - Keysight N5221A Service Manual

PNA Series Microwave Network Analyzers Theory of Operation
N5221A/22A Signal Separation Group Operation
A34–A37 65-dB Source Step Attenuators and A38–A41 Bias Tees
On 4-port models with some options, a step attenuator and a bias tee are placed in the signal path of each
test port between the A25–A28 receiver couplers and the A29–A32 test port couplers.
On 2-port models with some options, a step attenuator and a bias tee are placed in the signal path of each
test port between the A25 and A28 receiver couplers and the A29 and A32 test port couplers.
The 65-dB step attenuators provide coarse power control for the test port signals. They are
electro-mechanical step attenuators that provide 0 to 65 dB of attenuation in 5-dB steps. They adjust the
power level to the DUT without changing the level of the incident power in the reference path. These
attenuators are controlled by the A17 CPU board.
The bias tees are to provide DC biasing for the DUT.
Service Guide N5222-90001 5-19