Theory Of Operation
4-10 ME7838G System Operation
VectorStar ME7838 Series MM
PN: 10410-00306 Rev. F
4-15
4-10 ME7838G System Operation
This section describes the system operation of the ME7838G Broadband VNA System.
Stimulus Signal Generation
For operation in the frequencies below 54 GHz range, the MS4647B VNA outputs a stimulus signal from its
test port and feeds directly to the MA25400A Millimeter-Wave Module via coaxial cable. The MA25400A
Module then outputs the stimulus signal to its 0.6 mm Flange-based Coaxial Interface test port. The stimulus
signal is then delivered to the Device Under Test (DUT) via the 0.8 mm or 1 mm connector adapter, waveguide
adapter, or wafer probe attached to 0.6 mm Flange-based Coaxial Interface test port of the MA25400A
Millimeter-Wave Module.
For operation in frequencies 54 GHz and above, the MS4647B VNA outputs an RF signal to the 3739C Test
Set.
In the test set, the RF signal is amplified. It is then routed to the Port 1 RF Output or Port 2 RF Output via a
transfer switch and fed to the MA25400A Millimeter-Wave Modules.
In the MA25400A Millimeter-Wave Module, the frequency of the RF signal is doubled, tripled, doubled and
then tripled, or double-doubled and then tripled and then output to the DUT.
For operation between 54 GHz and 80 GHz, the frequency of the RF signal is doubled in the module. For
operation between 80 and 110 GHz, the frequency of the RF signal is tripled. For operation between 110 and
150 GHz, the frequency of the RF signal is doubled and then tripled. For operation between 150 and 220 GHz,
the frequency of the RF signal is double-doubled and then tripled.
Test Signal Processing
For operation in frequencies up to 30 GHz, the reflected/transmitted test signal received at the 0.6 mm
flange-based coaxial interface test port of the MA25400A Module is then fed back to the test port of the
MS4647B VNA for further signal processing.
For operation above 30 GHz, the MS4647B VNA outputs two LO signals to the 3739C Test Set. The LO signals
are amplified (and attenuated, if required). It is then routed to Port 1 LO Output or Port 2 LO Output and fed
to the MA25400A Millimeter-Wave Modules.
In the MA25400A Millimeter-Wave Module, a sample of the stimulus signal is down-converted to intermediate
frequency (IF) using the LO signal from the 3739C Test Set. The output is the Reference IF signal.
The reflected/transmitted test signal received at the 0.6 mm flange-based coaxial interface test port of the
MA25400A module is coupled to the test channel down-converter which converts the test signal to IF signal
using the LO signal from the 3739C Test Set. The output is the Test IF signal.
Both the Reference and Test IF signals are then fed to the 3739C Test Set. The IF signals pass through the
3739C Test Set and are fed to the IF Inputs of the MS4647B VNA for further signal processing.
Note
In the
MS4640B Series Microwave Vector Network Analyzer Maintenance Manual –
10410-00320
, refer to
Chapter 2—Theory of Operation
for signal processing details.
Summary of Contents for VectorStar ME7838 Series
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