Specifications

24
Hardware configuration
The recommended hardware configuration
for making pulsed absolute measurements will
provide a synchronized pulsed carrier signal
to both ports of the phase detector. Using this
approach, the phase detector produces an output
during the pulse “ON” interval. Figure 3-1 shows
the recommended configuration when a source
cannot be internally pulsed (connecting a pulse
modulator to the output of a source).
Step-by-step procedure
The following step-by-step procedure can be used
when making pulsed absolute measurements with
the Agilent E5500 series phase noise measurement
solutions. Modifications will be required for differ-
ent carrier frequencies, duty cycles, PRFs, source
types, and so forth. Two measurement examples
will be given: 1) a pulsed carrier absolute measure-
ment; and 2) a pulsed carrier absolute measure-
ment using a microwave downconverter.
Example 1: Absolute pulsed measurement—
Agilent 8663A versus 83732B
1. Connect the components as shown in Figure 3-1,
with the exception of routing the pulse genera-
tor signal directly to the “External Pulse Input”
port of the Agilent 83732B. The 83732B is inter-
nally pulse modulated instead of externally. Do
not connect the signal paths to the phase noise
measurement system at this step.
2. Set up the DUT (83732B).
a) Carrier frequency: 1.5 GHz
b) Amplitude: Set source power level for +10 dBm
at input port of 70420A.
c) External Pulse Enable
3. Set up the pulse generator.
a) Duty Cycle = 10%
b) PRF = 20 kHz
c) Amplitude = TTL output
Figure 3-1. Pulsed carrier absolute phase noise measurement configuration
Pulse
Generator
Source
"DUT"
Pulse
Modulator
Input
83732B
Input
Pulse
Modulator
Reference
Input
External
Pulse Input
Tune Volts
Out
RF
Output
EFC
PLL
8663 A
Calibration
Source