RFI-5G FE-Top SSV as run 13/11/2023 (1)

Document Scope

The objective of this document is to detail the procedures, results and conclusions to properly test at subsystem level the RFI-5G front-end top board. Several parts will be tested:

Test of the LNA chain
Test of the LO chain
Test of the Front-End top board RF
Test of the temperature sensor

The as run versions of this document will have the title as "RFI-5G FE-Top SSV as run dd/mm/yyyy".

Test of the LNA chain

Test Description and Objectives

The purpose of this test is to validate that the HMC342 LNA amplifier provides the expected +19 dB of gain for input signals between 24 to 25 GHz, and that the band-pass filter does not introduce more than the expected -4 dB of losses.

Since the probing used is not the frequency range used, this is only a qualitative test to check if the LNA is providing gain and validate that the consumption is nominal.

Requirements Verification

This test does not verify any requirement, and is only to check that the board part works as expected.

Test Set-Up

The required components for this test are the following:

RFI-5G front-end top board
C.FL to SMA-2.92mm adapter
C.FL cable
RF probe
SMA 50 Ohm RF load
DC Block N to SMA adapter
Power supply
Signal Generator capable of at least 25 GHz
Spectrum Analyzer capable of at least 25 GHz
2x Jumper cables
2x Banana cables
2x Crocodrile clips
2x SMA 2.92 mm cables
SMA to SMP cable

The steps to prepare the setup are the following:

Connect the output from the signal generator to the antenna input of the RFI-5G front-end top board by using the C.FL cable and the C.FL to 2.92 mm adapter.
Connect the power supply to the Vcc_LNA1 and GND pins with the jumper cables and the crocodile clips.
Connect the DC-block N to SMA adapter to the spectrum analyzer input.
Connect the RF probe to the spectrum analyzer using one SMA cable.
Connect the SMA 50 Ohm RF load to the output of the mixer with the SMA to SMP cable.

The diagram below represents the initial setup:

Pass/Fail Criteria

The test will be considered successful if the LNA shows to provide gain (~19 dB) and the power consumption matches the expected one (~43 mA at 3.3 V). There is though some margin accepted, since the RF probe and cables are not rated for the frequency range used.

Test Plan

Step ID	Description	Pass/Fail Criteria	Actual	Passed [Y/N]
RFI-5G-TOP-LNA-000	Make sure that the power supply and signal generator outputs are off.	Passes if power supply and signal generator outputs are off.		y
RFI-5G-TOP-LNA-010	Prepare the setup as stated in 2.3.	Passes if setup prepared.		y
RFI-5G-TOP-LNA-020	Set the power supply to 3 V and limit the current to 60 mA.	Passes if power supply set.		y
RFI-5G-TOP-LNA-030	Set the signal generator to: f = 24.5 GHz Pout = -70 dBm	Passes if signal generator set.		y
RFI-5G-TOP-LNA-040	Set the spectrum analyzer to: f = 24.5 GHz Span = 10 MHz RBW = 10 kHz VBW = 1 kHz Trace = Max Hold	Passes if spectrum analyzer set.		y
RFI-5G-TOP-LNA-050	Switch on the signal generator output.	Passes if signal generator output is on.		y
RFI-5G-TOP-LNA-060	Switch on the power supply. If the power supply is limiting switch it off immediately.	Passes if power supply is on and not current limiting.		y
RFI-5G-TOP-LNA-070	Note the voltage and current. If the current consumption is abnormal switch it off immediately.	Passes if voltage and current are within specification (some margin is allowed but has to be explained why).	Voltage:3V Current:42 mA	y
RFI-5G-TOP-LNA-080	With the RF probe, probe the input of the LNA by carefully touching with the signal pogo-pin the RF input pin of the LNA.	Passes if a signal is shown in the spectrum analyzer.	max hold of -70.61 dBm at center frequency	y
RFI-5G-TOP-LNA-090	Set the trace mode in the spectrum analyzer to VIEW to freeze the image.	Passes if trace mode is VIEW.		y
RFI-5G-TOP-LNA-100	Add a second trace in the spectrum analyzer with the same configuration as the first one.	Passes if spectrum analyzer set.		y
RFI-5G-TOP-LNA-110	With the RF probe, probe the output of the LNA by carefully touching with the signal pogo-pin the RF output pin of the LNA.	Passes if a signal is shown in the spectrum analyzer.	max hold of -46.95 dBm at center frequency	y
RFI-5G-TOP-LNA-120	Set the trace mode in the spectrum analyzer to VIEW to freeze the image.	Passes if trace mode is VIEW.		y
RFI-5G-TOP-LNA-130	Add one marker to the peak of trace 1, and another marker that measures the delta in the peak of trace 2. Note the gain and frequency delta values.	Passes if the gain is within specification (some margin is allowed but has to be explained why).	Gain: 23.66 dB Frequency: 0 Hz Gain between 16 and 26 dB. For 24.5 GHz, the gain should be lower according to datasheet	n
RFI-5G-TOP-LNA-140	Capture the screen of the spectrum analyzer and save it into a USB drive.	Passes if .wmf is saved into a USB drive.	File name: "LNA1-1 131123.WMF"	y
RFI-5G-TOP-LNA-150	Add a third trace in the spectrum analyzer with the same configuration as the first one.	Passes if spectrum analyzer set.		y
RFI-5G-TOP-LNA-160	With the RF probe, probe the output of the band-pass filter by carefully touching with the signal pogo-pin the RF output pin of the filter.	Passes if the gain is within specification (some margin is allowed but has to be explained why).	output level of -54.85 dBm, attenuation of 7.9 dB, much higher than the expected 2 dB of datasheet	n
RFI-5G-TOP-LNA-170	Set the trace mode in the spectrum analyzer to VIEW to freeze the image.	Passes if trace mode is VIEW.		y
RFI-5G-TOP-LNA-180	Add a third marker in trace 3. Note the power and frequency delta values with marker 1.	Passes if the gain is within specification (some margin is allowed but has to be explained why).	Gain: 15.76 dB Frequency: 0 Hz	n
RFI-5G-TOP-LNA-190	Capture the screen of the spectrum analyzer and save it into a USB drive.	Passes if .wmf is saved into a USB drive.	File name: "LNA1-2 131123.WMF"	y
RFI-5G-TOP-LNA-200	Switch off the power supply and the signal generator.	Passes if power supply and signal generator are off.		.y
RFI-5G-TOP-LNA-210	If all steps are passed, proceed with next test.	Passes if all steps passed.		n

Test Results

Description of the Test results with supporting data.

Test name, test execution dates, the test facility used and the operators
Test Logbooks
“As-run” procedures (to be provided in annex)
Test facility results (if applicable)
Photographs relevant to the set-up(s) and inspection(s) (may also be added in the Conclusions to clarify a close-out judgement, e.g. for an inspection)
Analysis of the test data and relevant assessment.
Synthesis of the overall test results per verification (e.g. Vibration, Inspection 1, Inspection 2, etc.).

Anomalies

LNA gain much higher than expected, filter attaenuation much higher than expected.

List of deviations to the Test Specification and Procedure and non-conformances witnessed during the test campaign, including a brief description, the close-out status and reference to the relevant reports.

Conclusions

Measurements differ too much from expected values, test is being re-done.

The Conclusions shall include (where needed as annex):

Test results, including as a minimum:
- Requirement to be verified
- Subsections of test campaign in which that requirement was verified (e.g. Thermal Vacuum RFT 1, Inspection 1, Inspection 2, ...)
- Close-out judgement (compliance status) and rationale, per subsection of the test
- Traceability to used documentation
- Conformance or deviation including references
Overall conclusion on the success of the test, including clearly stated and described open issues and possible remediating actions.
Test Readiness Review minutes and Post Test Review minutes