Operation and Features 2
Keysight U8903B User’s Guide 53
U8903B Block Diagram
Analog audio interface
Signal generation
A simplified U8903B analog generator block diagram is shown as follows.
Figure 2-1 U8903B analog generator block diagram
The digital signal processing (DSP) generates all the required waveforms, except for square
wave, digitally. The digital waveform data is streamed realtime into the 24-bit
digital-to-analog converter (DAC) where it is converted to voltage and sent to the output
conditioning block to be amplified or attenuated to the required amplitude. Finally, the
waveform is routed through either the balanced (XLR) or unbalanced (BNC) output signal
connectors to the unit-under-test (UUT). The output can also be fully floating or have the
output grounded to the instrument ground. There is also a loopback facility where the
analog generator can be connected onto the systems internal analog bus and routed to the
analog analyzer.
ANALOG GENERATOR
DAC FILTER RANGING
ISOLATED GROUND
LOOPBACK
BNC
XLR
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