TNP #35 - InPhi 43Gb/s 8Vpp Differential Mach-Zehnder Driver ASIC & Module Teardown & Analysis
15.4K views
May 7, 2023 7:22 PM
In this episode Shahriar takes a look at a high-speed driver module intended for coherent applications. The Mach-Zehnder driver circuit can reach speeds of 43Gb/s and provide up to 8Vpp into a differential modulator. The ASIC is realized in an InP HBT process and manufactured more than 21 years ago! The teardown shows the interface design as well as detailed circuit analysis & ASIC architecture.
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TNP #34 - Zeiss Microscope Motorized XYZ Axis Stage Focus Stacking & Image Stitching Tutorial
19.2K views
May 6, 2023 2:22 PM
In this episode Shahriar continues his journey with upgrading the Zeiss microscope. The microscope is now entirely motorized including the XYZ axis. This, combined with a high-quality Nikon DLSR allows the creation of some extraordinary focus stacked imaged. The interface between the microscope & DSLR is handled through an LMScope adapter:
https://www.lmscope.com/en/produkte_en.html
The microscope is controlled via a custom GUI which manages all of the microscope functions as well as a fully automated focus stacking routine.
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TNP #33 - OmniChrome Helium-Cadmium (HeCd) 442nm Laser Teardown, Theory & Experiments
24.8K views
April 30, 2023 2:48 PM
In this episode Shahriar dives into the detailed operation of a HeCd laser system. The laser head sub-components and principle operation is discussed as well as the teardown of the power supply and its primary sections. Various spectral measurements are performed on the laser output as well as the non-coherent emissions from the main laser cavity.
http://www.TheSignalPath.com
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TSP #225 - Agilent E5052A 7GHz Signal Source Analyzer Teardown, Repair & Experiments
19.8K views
April 22, 2023 9:51 PM
In this episode Shahriar takes a look at a faulty E5052A signal source analyzer. Despite their age, these signal-source analyzers are highly sought after and very valuable. Although the analyzer can measure phase noise, it reports the incorrect input signal power across frequency. Initial assessments shows that the reported measured power varies wildly across the band.
The system block diagram is shown and principle operation of the instrument is described. From there, a few measurements are devised to verify the operation of the detectors, power splitter, etc. The problem is traced down to a broken connector on a custom resistive power divider. After the repair, the instrument reports the correct power. The overall performance is verified by measuring the phase noise of a Signal House PNCS-1 using cross correlation techniques.
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TNP #32 - Fluke 732A DC (10V, 1.018V, 1V) Reference Standard Quick Repair
11.6K views
April 22, 2023 4:15 PM
In this episode Shahriar quickly repairs a faulty Fluke 732A DC Reference Standard. Although the unit does produce a good 10V and 1.018V output, the 1V output shows no voltage at all. A close examination of the schematic shows that the 1V output is derived through a resistor divider from the 10V source.
Since no resistance can be measured from the 1V to any of the other ports, it is suspected that the failure is caused by a broken connection behind the front panel. The connection is corrected and the unit produces all desired output signals.
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