PulseBlasterDDS-I-300
RF Output Level
There are currently two different options for PulseBlasterDDS-I-300 RF analog output amplifier – the standard gain and
the high gain. Figure 2, below shows the typical frequency characteristics of the analog output signals for the two output
options. The standard-gain PulseBlasterDDS-I-300 for a 50 Ω load has an output voltage of 1 Volt peak-to-peak at 10
MHz, with a 3 dB bandwidth of about 85 MHz. The high-gain amplifier with a 50 Ω load has a maximum output voltage of
about 3.75 Volts peak-to-peak, with a 3 dB bandwidth of about 21 MHz, while covering the same frequency range as the
standard-gain board.
Please note, the sustained analog output voltage feature is only available on PCI boards. To obtain a sustained
analog output voltage, set the frequency register to 0.0 Hz, and use the content of the phase registers to control the actual
output voltage level.
http://www.spincore.com
7
2017-11-14
Figure 2:
PulseBlasterDDS-I-300 analog output voltage vs. output frequency. The
dotted line represents the standard-gain output amplifier, and the solid line
represents the high-gain output amplifier. The voltage values are for a 50 Ohm
load impedance. The zero dBm output value for both amplifiers occurs at
approximately 90 MHz.
0
20
40
60
80
100
120
0
0.5
1
1.5
2
2.5
3
3.5
4
High Gain
Standard Gain
Frequency (MHz)
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vo
lts
p
k-
p
k
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5
0
O
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