System Operation - Agilent Technologies 8719ET Service Manual

8719ET/20ET/22ET Theory of Operation
8719ES/20ES/22ES

System Operation

RF Network Analyzers
System Operation
The 8719ET/ES, 8720ET/ES, and 8722ET/ES microwave network analyzers integrate a
synthesized source, signal separation devices, a three or four channel receiver for
measurement of test device characteristics, and a large-screen display. Figure 12-1 is a
simplified block diagram of the network analyzer system.
Figure 12-1 Simplified System Block Diagram
The built-in synthesized source of the analyzer generates a swept or continuous wave (CW)
signal in the following ranges:
8719ET/ES 8720ET/ES 8722ET/ES
50 MHz to 13.51 GHz 50 MHz to 20.05 GHz 50 MHz to 40.05 GHz
The source output power is leveled by an internal ALC (automatic leveling control) circuit.
The output maximum power levels at the front panel are listed in Table 12-1 on page 12-4.
A portion of the source signal is routed to the R sampler receiver, and fed back to the
source for phase lock.
Service Guide 12- 3