Signal Separation Group Operation - Agilent Technologies E8362A Service Manual

PNA Series Microwave Network Analyzers
E8362A, E8363A, E8364A

Signal Separation Group Operation

The signal separation group divides the source signal into a reference path and a test path.
Refer to Figure 5-3 on page
• The reference signal is transmitted to the receiver group.
• The test signal is transmitted through—and reflected from—the device under test
(DUT) and then is transmitted to the receiver group.
• Control lines to this group are routed from the A16 test set motherboard.
In this section, the following assemblies are described:
• A22 Switch Splitter
• A25 and A26 Test Port Couplers
• A23 and A24 Detectors (E8363A and E8364A Only)
• 30-dB Fixed Attenuators (E8362A Only)
• A36 and A37 60-dB Step Attenuators (Option UNL)
• A38 and A39 Bias Tees (Option UNL)
• Front Panel Jumpers
A22 Switch Splitter
For the E8363A and E8364A, the output of the A21 SOMA 50 is routed to the A22 switch
splitter. For the E8362A, this is the output of the A12 source 20 assembly. The A22 switch
splitter is a solid-state switch. It switches between the Port 1 and Port 2 measurement
paths, automatically enabling alternate forward and reverse measurements. The A22
switch splitter provides an internal termination for the measurement port that is inactive.
Each measurement path in the A22 switch splitter includes a two-way splitter; the signal
is split into the test port signal and the receiver signal.
The test port signal is sent directly through the test port coupler, A25 or A26, and out
through either PORT 1 or PORT 2 to the DUT, unless Option UNL is installed. In this
case, the signal is routed through the step attenuator, A36 or A37, the bias tee, A38 or A39,
then through the test port coupler and test port to the DUT.
The reference signal is routed to the appropriate R channel receiver module, A32 or A33,
through a detector, A23 or A24 (for E8363A and E8364A), or a 30-dB fixed attenuator (for
E8362A), and a receiver first converter, A28 or A29. If Option 014 is installed, the signal is
routed through a front-panel channel R jumper to the receiver first converter.
A25 and A26 Test Port Couplers
The test port signal goes into the through-line arm of the couplers, and from there to the
test ports and the DUT. The coupled arm of the couplers carries the signal reflected from or
transmitted through the DUT, to the receiver (through a front panel jumper for
Option 014) for measurement. The coupling coefficient of the directional couplers is
nominally 15 dB over the full frequency range.
Service Guide E8364-90001
5-16.
(Option 014 Configurable Test
Theory of Operation
Signal Separation Group Operation
Set)
5- 15