Keysight N9010A EXA Service Guide 261
Analog/Digital IF Troubleshooting
25 MHz BW IF Section
25 MHz BW IF Section
A2 Analog I.F. Assembly Description
The analyzer’s RF input signal is down converted to a 322.5 MHz intermediate
frequency in the A13 RF Front End Assembly. This 322.5 MHz signal is the
input to the A2 Analog I.F. Assembly. The Analog I.F. down converts the 322.5
MHz signal to a final 22.5 MHz intermediate frequency. In order to obtain
optimal dynamic range and minimize unwanted spurious signals, this signal is
filtered, amplified and attenuated throughout this assembly. The final 22.5
MHz signal goes through a series of variable band pass filters each having a
specific bandwidth. Three things determine the signal path and which filters
are chosen:
— Instrument resolution bandwidth (RBW) setting
—Application used
—Mode applied
This assembly contains the burst carrier trigger circuitry for performing mobile
communication measurements. The output of the assembly is a filtered
22.5 MHz signal that goes to the ADC on the A3 Digital I.F. Assembly.
Inputs to the A2
322.5 MHz signal (from either the A13 RF Front End Assembly or the A15
Front End Control Assembly)
LO Input (300 MHz signal from A16 Reference Assembly)
22.5 MHz Cal Comb Signal (from the A3 Digital I.F. Assembly)
Outputs from the A2
22.5 MHz signal (to A3 Digital I.F. Assembly)
RF Trigger Detector (to A3 Digital I.F. Assembly)
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