248 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Hardware Options
Option H1G, 1 GHz Analysis Bandwidth Assembly
Option H1G, 1 GHz Analysis Bandwidth Assembly
Description
Option H1G provides 1 GHz Analysis Bandwidth in I Q Analyzer mode.
Signal Analyzer Hardware Requirements
— Analyzer frequency range 50 GHz or above
— Option H1G licensed
— H1G hardware Installed.
1 GHz Analysis Bandwidth Assembly Theory of Operation
The input signal is down converted to a 750 MHz IF in the A13 Front End
assembly. The Front End assembly has a 1 GHz bandpass filter that is switched
into the Lowband (<3.6 GHz input signal) signal path using coax switches
mounted on the front end assembly. In the high band signal path, the
preselector is bypassed to allow ample bandwidth.
Refer to Figure 11-5, “Option H1G Block Diagram,”. The 750 MHz IF signal is
routed from the A15 Front End Control assembly J901 to A21J17 on the A21
Wideband Analog IF assembly that is used in the 255 MHz IF Path. The
750 MHz IF signal leaves the A21 Wideband Analog IF through J18 and goes to
the A27 1 GHz BW assembly.
The A27 1 GHz bandwidth assembly consists of a 1 GHz Analog IF and a
Digital IF assembly and interface boards that allows insertion into the rear
motherboard. The entire assembly must be replaced because the
interconnections are difficult to remove/attach and troubleshooting the
individual board assemblies is very difficult due to packaging constraints and
lack of test points. Therefore the entire assembly must be replaced.
Option B2X, 255 MHz BW hardware is present on instruments that contain
Option H1G. The "B2X" A21 Wideband Analog IF assembly provides signal
routing.
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