
Waveform Generators 7 Analog Modules
System Reference, January 2001
201
AWG Instrument
The AWG instrument is installed in the analog support
rack. The AWG instrument consists of the following
blocks.
• Analog output circuit
• Digital-to-analog converter
• Clock ocsillator
• Sequencer and waveform memory
The following sections describe the functions of each
block.
Analog Output Circuit
The analog output circuit has the following circuits.
• Attenuator for adjusting the amplitude of the output
signal
• Low pass filter for removing harmonics from the
output signal
• DC offset circuit
• Output amplifier
The ultra high speed AWG has two output modes. One is
normal mode and the other is direct mode. The direct
mode can generate a signal of higher frequency than the
normal mode. In the direct mode, the DAC output propa-
gates to the pogo pin not through the filter and DC offset
circuit, but only the attenuator.
Digital-to-Analog Converter (DAC)
The analog-to-digital converter (DAC) converts the digital
waveform data transferred from the waveform memory to
the analog signal, according to the output sequence from
the sequencer. The DAC converts the digital data to the
analog signal according to the conversion clock provided
by the clock oscillator.
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