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

The Signal Path 37.7K views May 25, 2024 7:18 PM

1.8K 168

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

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

The Signal Path 14.9K views April 27, 2024 5:36 PM

2.5K 245

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.

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

The Signal Path 22.9K views April 19, 2024 6:49 PM

1.3K 61

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.

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

The Signal Path 12.2K views March 30, 2024 12:05 AM

963 46

-= Description coming soon! =-

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

The Signal Path 13.7K views March 24, 2024 10:50 PM

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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

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

The Signal Path 7.5K views March 15, 2024 11:29 PM

650 46

-= Description coming soon! =-

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

The Signal Path 15.7K views March 9, 2024 4:44 PM

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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.

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

The Signal Path 17.6K views March 2, 2024 5:31 PM

1K 80

-= Description coming soon! =-

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

The Signal Path 21.6K views February 28, 2024 6:55 PM

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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/

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

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

The Signal Path 24.7K views January 26, 2024 10:23 PM

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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

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TNP #46 - Torbal AD60 Precision Balance (0.001g) Repair, Teardown & Experiments

The Signal Path 14.1K views January 11, 2024 12:16 AM

1.5K 72

In this episode Shahriar takes a look at a Torbal precision scale capable of resolving 0.001g! Unfortunately the unit shows an error of "Unload" when powered on. The teardown of the unit as well as the principle operation is described. The teardown also reveals the problem with the scale mechanism which is a broken link. The repair correct the problem and the scale shows excellent accuracy with calibrated weights. The live evaporation of Acetone is also shown using the precision balance.

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TNP #45 - Tektronix TekVPI TPA-BNC (TekProbe Converter) Adapter Repair & Teardown

The Signal Path 9.7K views January 3, 2024 11:29 PM

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In this episode Shahriar upgrades the internal firmware of a TPA-BNC TekVPI adapter. The teardown of the adapter is presented and the internal architecture described. The firmware is copied from a newer unit to the faulty one and the adapter can now detect a wide range of probes.

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