Agilent Technologies N5242A - Page 123

Service Guide N5242-90001 5-5
PNA Series Microwave Network Analyzers Theory of Operation
N5242A Network Analyzer System Operation
Synthesized Source Group
The built-in synthesized source generates a swept, stepped, or continuous wave (CW)
signal in the frequency ranges as listed in Table 5-1. The source group provides five
signals: an LO signal and four incident signals. The LO signal and the four incident
signals are offset in frequency by the receiver IF of 7.606 MHz (at tuned frequencies below
53 MHz the IF and the offset is 2.535 MHz).
The LO signal is sent directly to the mixers in the receiver group. The incident signals are
routed to the front panel test ports and then to the device under test (DUT) as the test
signal. A portion of each incident signal is coupled off (in the signal separation group) and
sent to the mixers in the receiver group as reference signals. These reference signals are
compared (mixed) with the LO signal in the receiver group to produce the 7.606 MHz (or
2.535 MHz at frequencies below 53 MHz) IF signal.
The incident signal output power is leveled by an internal automatic leveling control (ALC)
circuit. The maximum output power level of the network analyzer at the test ports is
shown in Table 5-1.
Refer to “Synthesized Source Group Operation” on page 5-7.
Table 5-1 Frequency Range and Maximum Output Power Level
Options
Nominal
Output Power
at Instrument
Preset
Maximum Leveled Output Power (in dBm)
Ports
10 MHz
to
50 MHz
50 MHz
to
500MHz
500 MHz
to
3.2 GHz
3.2 GHz
to
10 GHz
10 GHz
to
16 GHz
16 MHz
to
20 GHz
20 GHz
to
24 GHz
24 GHz
to
26.5 GHz
200
0 dBm 1 +8 +10 +10 +13 +13 +13 +12 +5
0 dBm 2 +13 +13 +13 +13 +13 +10 +7 +2
219
-5 dBm 1 +8 +10 +10 +13 +12 +10 +8 +3
-5 dBm 2 +13 +13 +13 +13 +11 +8 +7 -1
224
-5 dBm 1 +7 +8 +8 +13 +12 +10 +7 0
-5 dBm 2 +13 +13 +13 +13 +10 +7 +5 -2
+5 dBm
SRC 2
OUT 1
+9 +11 +10 +18 +16 +15 +13 +7
+5 dBm
SRC 2
OUT 2
+13 +17 +14 +18 +16 +13 +12 +5
400
0 dBm 1, 3 +8 +10 +10 +13 +13 +13 +12 +5
0 dBm 2, 4 +13 +13 +13 +13 +13 +10 +7 +2
419
-5 dBm 1, 3 +8 +10 +10 +13 +12 +10 +8 +3
-5 dBm 2, 4 +13 +13 +13 +13 +11 +8 +7 -1
423
-5 dBm 1, 3 +7 +8 +8 +13 +12 +10 +7 0
-5 dBm 2, 4 +13 +13 +13 +13 +10 +7 +5 -2