Chapter 6
Theory of Analog Operation
©
National Instruments Corporation
6-7
PCI-4451/4452/4453/4454 User Manual
versus sample rate for the PCI-4451/4452 is illustrated in Figure 6-3, and
for the PCI-4453/4454 in Figure 6-4. For frequencies not near multiples of
the oversample rate, the rejection is better than 85 dB.
Figure 6-3.
Alias Rejection at the Oversample Rate for the PCI-4451/4452
Alias Rejection (dB)
Over-Sample
Frequency
0.00
–10.00
–20.00
–30.00
–40.00
–50.00
–60.00
–70.00
–80.00
1 kS/s
10 kS/s
100 kS/s
1 MS/s
Sample Rate
128 kHz
1.28 MHz
12.8 MHz
128 MHz
5 kS/s
640 kHz
