Datasheet

Data Sheet
The orange
waveform in the Time Domain view is the frequency vs. time trace derived
from the RF
input signal. Notice that Spectrum Time is positioned during a transition from
the highes
t frequency to the lowest frequency, so the energy is spread across a number of
frequenci
es. With the frequency vs. time trace, you can easily see the different frequency
hops, sim
plifying characterization of how the device switches between frequencies.
Visualizing Changes in Your RF Signal
The time domain graticule on the MDO4000 Series display provides support
for three RF time domain traces that are derived from the underlying I and Q
data of the RF input including:
Amplitude – The instantan eous amplitude of the RF input vs. time
Frequency – The instanta neous frequency of the RF input, relative to the
center frequency vs. time
Phase – The instantaneous phase of the RF input, relative to the center
frequency vs. time
Each of these traces may be turned on and off indepe ndent ly, and all three
may be displayed simultaneously. RF time domain traces make it easy to
understand wha
t’s happening with a time-varying RF signa l.
Advanced Triggering
In order to deal with the time-varying nature of modern RF applications,
the M DO4000 Series provides a triggered acquisition system that is fully
integrated with the RF, analog, and digital channels. This means that a
single trigge
r event coordinates acquisition across all channels, allowing
you to ca pture a spectrum at the precise point in time wh ere an interesting
time domain event is occurring. A comprehensive set of time domain
triggers are available, including Edge, Seq uence, Pulse Width, Timeout,
Runt, Logic, Setup/Hold Violation, Rise/Fall Time, Video, and a variety
of parallel and serial bus packet triggers. In addition, you can trigger on
the power lev
el of the RF input. For example, you can trigger on your RF
transmitter turning on.
The optional
MDO4TRIG application module provides advanced RF
triggering. This module enables the RF input power level t o be used as a
source for Sequence, Pulse Width, Timeout, Runt, and Logic trigger types.
For example, you can trigg er on a R F pulse of a specific lengt h or use the
RF channel as an input to a logic trigger, enabling the oscilloscope to t rigger
only when the RF is on while other signals are a ctive .
4 www.tektronix.com