Keysight N9038A MXE Service Guide 337
Analog & Digital IF
A3 Digital I.F. Assembly Description
A3 Digital I.F. Assembly Description
A3 Digital IF Assembly Purpose
The A3 Digital IF has circuitry that is needed to analyze complex
communication signals that can occupy up to 25 MHz of information
bandwidth. It digitizes the final 22.5 MHz IF from the A2 Analog IF board, by
processing the time domain continuous data into I/Q (in-phase and
quadrature) signals before sending the data to the A4 CPU assembly for further
processing and front panel display.
The A3 Digital IF assembly performs the following main functions:
— Digitizes the final 22.5 MHz Intermediate Frequency
— 14 bit ADC with a 90 MHz sample rate
— DSP for standard spectrum analysis
— Capture memory for complex signals
—Noise Source Control
— Dither for final IF
— Provides the alignment sequence generator for wide band alignments
— Provides wide band Comb Calibration Signal
— Trigger interpolation and associated alignment
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