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Theory of Operation
3-2
AWG510 & AWG520 Service Manual
This functional block amplifies the DAC analog signals to the specified output
level. The input signals may pass through the low–pass filters and attenuators in
this block. If an offset is specified, the Offset circuitry will add it. This board
also has an adder circuitry for adding the signal from the A75 Noise Generator
board or the Add Input on the rear panel to the output waveform.
The output waveforms are supplied at two BNC connectors on the front panel
with 50 W impedance (AWG510: CH 1 normal and CH 1 invert. AWG520: CH 1
and CH2).
This block is in the Output block and generates noise for adding to CH 1, CH 1
,
or the external output.
The CPU Unit has four slots and contains the CPU module, a hard disk and a
flash disk, the Ethernet LAN and GPIB interface cards, and a backplane.
Backplane. The backplane has four ISA bus slots. This board receives power
from Power Supply and sends it to each card board. Commands are also
transmitted via the backplane.
CPU module. The first slot of the CPU Unit has the CPU module that contains the
Intel DX4 (100 MHz) CPU and system RAM (64 MB SIMM).
The CPU module directs operation of all internal circuits based on the front
panel control and commands received over the GPIB interface. It also generates
and sends vertical (VSYNC) and horizontal (HSYNC) sync signals to the tube
assembly.
Hard disk/Flash disk. The second slot of the CPU Unit has a flash disk for storing
the waveform generator firmware and 1.4 GB hard disk for mass storage. They
are fixed with brackets and don’t use ISA bus.
LAN Interface Card. The third slot of the CPU Unit has the Ethernet LAN
interface card. It controls Ethernet communication in LAN environment. The
waveform generator has a 10BASE–T connector on the rear panel.
Analog Processing
(A71/A72, Analog Output
Board)
Noise Generation
(A75, Noise Generator
Board)
CPU Unit