242 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Baseband Generators
A2 Vector BBG Assembly Overview
A2 Vector BBG Assembly Overview
Refer to Chapter 13, “Block Diagrams,” for a visual description of the major
blocks of circuitry contained in the A2 Vector BBG assembly.
The part number and serial number of the A2 Vector BBG assembly installed in
an instrument can be seen as the BB entry on the Utility, Instrument Info,
Installed Board Info screen, as shown in Figure 12-1.
Figure 12-1 Installed Board Info Screen
The A2 Vector BBG assembly is a self-contained Arbitrary (ARB) Baseband
Generator (BBG) assembly, that supports digital modulation in the N5166B,
N5172B, and N5182B vector signal generators.
There are two basic sections of the A2 Vector BBG assembly:
—RF Section
— Digital Section
RF Section
The RF section of the A2 Vector BBG assembly receives the RF signal at P1
from the A3 RF assembly from the output of the synthesized multiplier/divider
section. The signal is then adjusted for an optimum level, I/Q modulated,
filtered, and amplified before being returned at P2 to the A3 RF assembly just
prior to its RF output section. There are several adjustments related to the RF
section found in the performance verification and adjustment software for
these instruments, which will be covered later in this chapter.
When digital modulation is turned off the A2 Vector BBG assembly’s RF
section is bypassed by the A3 RF assembly.
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