User`s manual

Trigger Circuitry The trigger circuitry advances the waveform to the next segment. The
external trigger sources advances the waveform directly. Thus, the sample
rate and resultant waveform frequency depend on the frequency of the
applied triggers.
Output Circuitry The output circuitry outputs the waveform at the front panel’s “Output”
connector. The circuitry sets the output amplitude, offset voltages, output
impedances, and has a 250 kHz and a 10 MHz low-pass filter. (See
“Output Circuitry Description” on page 451 for more information.)
Microprocessor The AFG uses a Motorola 68000 microprocessor to generates the waveform
segments and segment sequences for the standard waveforms.
Generating Sinusoid Waveforms
Refer to Figure 10-5. The AFG uses the DDS (Frequency1) frequency
generator to generate Sinusoid waveforms. The generator output directly
supplies the DAC data for the output DAC to generate the waveforms.
Figure 10-5. Generating Sinusoid Waveforms
450 Block Diagram Description Chapter 10