Output Amplitude Control
The 33120A uses a 12-bit digital-to-analog converter (DAC) to convert
the digital representation of a signal to an analog output voltage. The
DAC
can create waveforms represented by 4,096 (2
12
) discrete amplitude
levels. All 4,096 amplitude codes are used for the built-in waveforms.
Output levels from full maximum to minimum output are controlled by
applying varying amounts of signal gain or attenuation to the signal
created by the
DAC as shown in the block diagram below. The output
waveform is always described by the full 12-bit vertical resolution. You
can download user-defined arbitrary waveforms using less than the full
12-bit vertical resolution; however, it is recommended that you always
use the full
DAC amplitude resolution to minimize amplitude
quantization errors as previously discussed.
48-Bit
PIR
48-Bit
PIR
Wfm
RAM
DAC
Clock
14-Bit
Address Data
12-Bit
Amplitude Data
Anti-Alias
Filter
A
50
W
Step Attenuator Load
Chapter 7 Tutorial
Output Amplitude Control
280
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