YouTube Feed

The Signal Path 122K

TSP #247 - World's Largest Microwave Industry Exhibition - IEEE Microwave Symposium, Washington 2024

views June 28, 2024 11:48 AM

In this episode Shahriar visits the Industry Trade Show at IMS Microwave Week held in Washington DC this year. Although it is impossible to capture everything at this amazing event, here is a look at some of new products and components from 25 of the vendors at the show.

00:00 - Introductions
00:53 - R&S: https://rohde-schwarz.com
09:55 - Keysight: https://keysight.com
15:23 - Signal Hound: https://signalhound.com
18:24 - Millibox: https://millibox.org
19:46 - MPI Corp: https://mpi-corporation.com
21:56 - Junkosha: https://junkosha.com
23:38 - AARONIA: https://aaronia.com
26:17 - Focus Microwave: https://focus-microwaves.com
28:54 - VDI: https://vadiodes.com
31:56 - MI-Wave: https://miwv.com
34:32 - Flann: https://flann.com
36:06 - Eravant: https://eravant.com
37:28 - Tabor Electronics: https://taborelec.com
38:39 - Swiss-to-12: https://swissto12.com
40:25 - Maury Microwave: https://maurymw.com
43:58 - Copper Mountain: https://coppermountaintech.com
45:21 - Microsanj: https://microsanj.com
47:05 - eV Technologies: https://ev-technologies.com
48:35 - Siglent: https://siglentna.com
50:29 - Tektronix: https://tek.com
52:54 - UNI-T: https://uni-trend.com
54:02 - GGB PicoProbe: https://ggb.com
54:44 - Presidio: https://presidiocomponents.com
56:14 - RF-Lambda: https://rflambda.com
57:41 - IronWood: https://ironwoodelectronics.com
58:51 - Closing remarks

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TNP #48 - Multi-Stage Turbomolecular Pump (Turbo-Pump) Theory of Operation, Assembly & Experiment

views June 21, 2024 11:15 PM

In this episode Shahriar tries to get a multi-stage Turbo Pump running. The unit comprises cylinder-based rouging pump into two stages of turbo pumps. The entire system is described with various interlock and controller mechanisms. The top blades of each pump are also shown.
The pump reached 10^-6 Torr fairly quickly but will likely need additional cleaning and long runtime to achieve anything below 10^-7 Torr.

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #246 - High-Voltage Amplification, Signal Generation, Power Supply Design Tutorial & Experiments

views May 25, 2024 7:18 PM

In this episode Shahriar dives into the world of high-voltage circuit design. In order to appreciate the engineering involved in the design of a 40kV amplifier, various design techniques for power supplies and their applications are presented. This tutorial is organized as follows:

00:00 - Introductions
00:29 - Amplifier design specifications and challenges
03:18 - Typical high-voltage generation using transformers and its limitations
06:41 - Open-loop transformer high-voltage power supply for discharge tube use-cases
10:18 - Inaccurate HV power supply making precision isolation measurements with Fluke 1587 FC
12:39 - Stanford Research PS350 high-voltage DC power supply design and measurements
21:44 - Vitrek V74 HiPot safety tester design, applications and example breakdown measurement
27:01 - Architecture of a high-voltage amplifier circuit, circuit diagram and theory of operation
32:43 - Teardown & analysis of the Trek Model 20/20B +/- 20kV amplifier instrument
42:02 - Linearity and waveform measurements of the high-voltage amplifier instrument
46:26 - Making ultra-high voltage time-domain measurements using a capacitive divider
48:45 - Discharge tube response as a function of AC frequency & high-power sparks
50:12 - Concluding remarks

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #245 - The Signal Path Philosophy, Future & You Won't Believe What Happens Next Clickbait!

views April 27, 2024 5:36 PM

Thank you all who support the channel, you make it all possible. And of course thanks to everyone who has watched and benefitted from my content.

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #244 - Agilent 3458A 8.5-Digit Multimeter Repair, Teardown & IC Analysis (April 2024)

views April 19, 2024 6:49 PM

In this episode Shahriar repairs a faulty Agilent 3458A. These highly desirable multimeters have continued to climb in price in the past few years. The last time The Signal Path has repaired one of these units was back in 2018.

This instrument generates several errors both during power up as well as Auto Cal procedure. The error points to a failure in the OHMS measurement mode. Detailed instrument block diagram and schematics are examined. Measurements also show incorrect DC current sourcing during OHMS measurements and the associated circuits are closely analyzed. The problem is traced to a quad-comparator IC. Replacement corrects all problems during ACAL. The battery backup of the SRAM ICs are also replaced to eliminate non-volatile errors. The IC of the comparator chip is also extracted and examined under the microscope.

The repaired instrument performance is verified by using voltage, current and resistance standards.

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #243 - Agilent FieldFox N9912A 4GHz Handheld RF Analyzer Repair & Teardown

views March 30, 2024 12:05 AM

In this episode Shahriar repairs an Agilent N9912A which flags several error messages after bootup. The instrument reports hardware time-outs and occasionally ADC clock source unlock condition. The second error is much more useful in debugging the unit.
The block diagram of the instrument is presented and several potential failures anticipated.

The teardown of the unit and analysis is also presented. After some troubleshooting, it becomes clear that the primary 30MHz TCXO has a broken internal connection. The unit is disassembled and new pins installed. After putting the TCXO back into the unit, the instrument return to full functionality. A few quick experiments verify that the FieldFox performs both CAT and SA modes correctly.

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #242 - Sanko GH60 6GHz Handheld Vector Signal Generator Review, Teardown & Experiments

views March 24, 2024 10:50 PM

In this episode Shahriar shows an extensive review of the Sanko (BirdRF) GH60 GeneHawk handheld vector signal generator which operates from 10MHz – 6GHz. With up to 100MHz of modulation bandwidth (licensed) the unit has good potential for a portable wide-band communication signal generator:

https://www.sankorf.com/products/portable-signal-generator-gh60

This review is organized as follows:

00:00 – Introductions, unit overview, operating system & GUI initial impressions
02:33 – Detailed teardown, construction, RF & baseband board analysis
19:16 – Frequency accuracy and stability measurements
20:31 – Output power measurement, power linearity and minimum output power
24:28 – CW signal analysis, noise-floor, harmonic behavior and spurious tones
27:15 – Phase noise characterization, spurs and far-out noise floor
28:41 – Two-tone generator, TOI (OIP3), image rejection, LO rejection, intermodulation tones
31:13 – Pulse generation, minimum pulse behavior
33:36 – Linear frequency generation measurements & characteristics
34:58 – FM, AM & PM capabilities and characterization methods, multi-modulation options
37:22 – Frequency sweep behavior and limitations
40:07 – Custom digital modulation, EVM measurements, I/Q & magnitude error, equalization
43:05 – Real-time AWGN performance and measurements
44:00 – Other software features, up-coming API and waveform standards
44:44 – Concluding remarks

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #241 - Ametek Jofra CTC-140A (-17C TO +140C) Dry Block Calibrator Repair & Teardown

views March 15, 2024 11:29 PM

In this episode Shahriar takes a look at a faulty dry block calibrator from Ametek. These Jofra series temperature calibrators are widely used for thermostat validation as well as material analysis. This particular unit does not cool down or warm up but seems otherwise functional.
A brief set of measurements shows that one of the Peltier elements is damaged and should be replaced. A replacement is located and the temperature well is re-sealed. The unit is functional and the minimum temperature performance is verified.

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #240 - Rohde & Schwarz 70GHz, 75dB Electromechanical Step Attenuator Teardown & Failure Analysis

views March 9, 2024 4:44 PM

In this episode Shahriar takes a look at a very high-end step attenuator designed by Rohde & Schwarz for their FSU family spectrum analyzers which cover over 67GHz of sweep frequency.

The attenuator teardown and architecture is thoroughly presented with focus on how the high-frequency performance is maintained in a moving environment. Furthermore, the individual attenuator pads are examined under the microscope for their construction and design where the 5dB pad failure can also be observed.

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TNP #47 - SHF 100CP 20GHz Broadband GaAs FET Amplifier Teardown & Experiments

views March 2, 2024 5:31 PM

In this episode Shahriar takes a close look at a 20GHz GaAs amplifier module intended for 40Gb/s optical applications. Despite being marked as "broken", initial measurements show the amplifier to be functional A teardown of the module is presented alongside detailed performance verifications and measurements.

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #239 - SJL Instruments 6GHz GigaWave Sampling Oscilloscope Review, Teardown & Experiments

views February 28, 2024 6:55 PM

In this episode Shahriar review the new sampling oscilloscope from SJL Instruments. Our GigaWave™ digital sampling oscilloscopes offer 12-bit vertical resolution, 1-ps time resolution, and 6 GHz analog bandwidth, all in a tiny 4” form factor:

https://www.sjl-instruments.com/

You can also find an on-going discussion about the instrument here:

https://www.eevblog.com/forum/testgear/pocket-sized-6-ghz-1-tss-et-scope

This review is organized as follows:

00:00 - Introductions
00:34 - Sampling scope & real-time scope theory and comparison
04:13 - CDF versus PDF method of waveform reconstruction
06:12 - Teardown & circuit analysis
09:35 - Input return loss characteristics and channel isolation
10:36 - GUI overview, capturing a fast pulse, comparison with Keysight DCA-X, built-in measurements, dot and vector mode
19:09 - Eye diagram measurements, ISI measurements, multi-channel view
24:15 - Multi-tone capture, FFT functions
25:09 - Concluding remarks

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...

TSP #238 - Rohde & Schwarz FE170SR D-Band (110 - 170GHz) Sub-THz Frontend Overview & Experiments

views January 26, 2024 10:23 PM

In this episode Shahriar takes a close look at the Rohde & Schwarz FE170SR which is the world's first fully abstracted D-Band front-end module. Intended for early sub-terahertz 6G research, the fully integrated module is capable of seamlessly interfacing with both spectrum analyzers and oscilloscopes - only a 10MHz reference is needed!

https://www.rohde-schwarz.com/us/products/test-and-measurement/frontends-and-converter/rs-fe170sr-frontend_334208.html

The video goes over the history and evolution of external mixers and front-ends to better capture the uniqueness of the FE170SR. The internal block diagram and theory of operation of the instrument is also presented. Experiments show detailed measurement techniques using the FE170SR and the RTP oscilloscope. The integration of the FE170SR with R&S VSE is also presented through demodulation of broadband QAM signals at a carrier of 145GHz.

Furthermore, the newly released R&S Thermal Power Sensor at D-Band is also shown in the video:

https://www.rohde-schwarz.com/us/products/test-and-measurement/rf-and-microwave-power-sensors/rs-nrpxxt-tn-twg-thermal-power-sensors_63493-197529.html

Please consider supporting The Signal Path:
https://www.TheSignalPath.com/Donate
https://www.Patreon.com/TheSignalPath

Other links:
https://www.TheSignalPath.com
https://www.Twitter.com/TheSignalPath
...