Chapter3 DigitizerBasics
NI5102 User Manual 3-2 ni.com
Analog Bandwidth
Analog bandwidth describesthe frequency range (in hertz) in which a
signalcan be digitized accurately. This limitation is determined by the
inherent frequency response of the input path—from the tip of the probe
to the input of the ADC—which causes loss of amplitude and phase
information.Analog ban dwidth is the frequency at which the measured
amplitude is 3 dB below the actual amplitude of the signal. Figure 3-2
illustrates the effect of analog bandwidth on a high-frequency signal.
The resulti s a loss of high-frequency components and amplitude in the
original signal as the signal passes through the digitizer.
Figure3-2. AnalogBandwidth
Bandwidth
+2V
+1V
0V 0V
+1/2V
–1/2V
–1V
–2V
InputSignal Instrument MeasuredSignal
abc abc