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Theory of Operation
Theory of Operation
3Ć2
DigitalĆtoĆAnalog Converter (DAC) (A11 D/A Board)
This functional block is a 12Ćbit highĆspeed digitalĆtoĆanalog converter. It
converts the digital data from the waveform memory into analog signals.
Analog Processing (A3/A23 Analog Board)
This analog processing block amplifies the analog signals from the DAC to
the necessary amplitude. If an offset is specified, this circuit adds that offset
and outputs the result at the output connector for that channel. This circuit
also contains a filter, an AM modulator, and other elements that modify
waveform output. Its output impedance is 50 W.
CPU and Memory (A6 CPU Board)
This functional block directs operation of all internal circuits, based on front
panel control operation and commands received over the GPIB or RSĆ232ĆC
interface. This circuit includes the 68000 CPU, DRAM, EPROM, SRAM. Data
in memory is retained by a lithium battery on the A5 Backplane board.
CAUTION
To avoid losing waveform data files stored in NVRam, save the files
to a floppy disk before removing the A6 CPU board or A5 BackĆ
plane board. Then restore the files from floppy disk to AWG2005
NVRam after reinstalling the board(s).
GPIB (A6 CPU Board)
This functional block is the General Purpose Interface Bus (GPIB) interface
driver, which controls communication with external devices over the parallel
interface. The GPIB connector is on the rear panel.
RSĆ232ĆC (A6 CPU Board)
This functional block is the RSĆ232ĆC interface circuit which controls serial
communication with external devices over the RSĆ232ĆC interface. The
RSĆ232ĆC interface connector is on the rear panel.
Display Control (A6 CPU Board)
The display control block processes the test and waveform information
based on commands from the processor. The block sends the text and
waveform information to the display monitor as video signals with vertical
and horizontal sync control.