©
National Instruments Corp.
17
NI 9237 Operating Instructions and Specifications
or signals that have been filtered by at least the amo
u
nt of the
stopband rejection.
Passband
The signals within the passband have freq
u
ency-dependent gain or
atten
u
ation. The small amo
u
nt of variation in gain with respect to
freq
u
ency is called the passband flatness. The digital filters of the
NI 9237 adj
u
st the freq
u
ency range of the passband to match the
data rate. Therefore, the amo
u
nt of gain or atten
u
ation at a given
freq
u
ency depends on the data rate. Fig
u
re 4 shows typical
passband flatness for the NI 9237.
