Hardware Layout - Oscilloscope Front End Design Talk (part 2) @KeysightLabs

Keysight Labs | Hardware Layout - Oscilloscope Front End Design Talk (part 2) @KeysightLabs | Uploaded June 2017 | Updated October 2024, 19 hours ago.
What's behind your oscilloscope's BNC? Analog IC designer Mike Lujan lays it out - part 2 of "Oscilloscope Front End Design" talk
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Part 1: What is an Oscilloscope?
youtu.be/o-JvRlKCOaM

Part 2: Hardware Layout - What's Behind the BNC?
youtu.be/EaBSN6dpqP8

Part 3: Attenuators and Preamps
Link coming soon!

Part 4: Signal Offsets and Filters
Link coming soon!

Part 5: Probing
Link coming soon!

Mike starts this section of the presentation by highlighting the five requirements of an oscilloscope front end.

First, a front end has to scale the input signal to the input range of the analog to digital converter (ADC). Second, the oscilloscope front end has to provide offset subtraction. Third, it must handle impedance conversion between the signal input and the oscilloscope ADC. Next, it must provide oscilloscope hardware filter options. Finally, it needs to provide oscilloscope trigger filtering and trigger comparators.

Second, he looks at the different specs and characteristics of an ADC. Range, bits of resolution (number of bits), number of codes, resolution, and sample rate.

Finally, he discusses the role of preamps and attenuators in signal scaling for ADCs. Stay tuned for part 3, when Mike discusses the specifics of oscilloscope attenuator and oscilloscope preamp design.

Twitter: @DanielBogdanoff twitter.com/DanielBogdanoff

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oscilloscopelearningcenter.com

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#tutorial #electronics #oscilloscopes #oscilloscope #engineering
#design #IC #ASIC #electrical #test #measurement #ADC

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$Optical 101 - EEs Talk Tech #9 Dark fiber, undersea cables, and the basics of optical communication Click to subscribe! ► http://bit.ly/Scopes_Sub ◄ Daniel Bogdanoff and Mike Hoffman sit down with Stefan Loeffler to discuss the world of optical communication. Now available on your favorite podcast platform and at https://EEsTalkTech.com Twitter: @DanielBogdanoff https://twitter.com/DanielBogdanoff Learn more about using oscilloscopes: http://oscilloscopelearningcenter.com Check out the EEs Talk Tech electrical engineering podcast: https://www.youtube.com/playlist?list=PLzHyxysSubUnAMeCIi2-S0Vm7YtSAGqx_ https://EEsTalkTech.com The 2-Minute Guru Season 2 playlist: https://www.youtube.com/playlist?list=PLzHyxysSubUlqBguuVZCeNn47GSK8rcso The 2-Minute Guru Season 1 playlist: https://www.youtube.com/playlist?list=PLzHyxysSubUkc5nurngzgkd2ZxJsHdJAb More about Keysight oscilloscopes: http://bit.ly/SCOPES Check out our blog: http://bit.ly/ScopesBlog Like our Facebook page: https://www.facebook.com/keysightbench/ Optical and electrical - 0:00 Stefan was at OFC 1:00 What is optics? 1:21 What is optical communication? 1:30 Theres a sender and a receiver Usually we use a 9 um fiber optic cable But sometimes we use air as a medium 1:50 How Stefan got into optical 2:00 The transmitter is usually a laser 3:35 Why LEDs dont work for optical 3:50 Optical alignment is a challenge 5:00 Alignment is often done by robotics How is optical different from electrical? 6:30 Photodiodes are receivers, and use a transimpedance amplifier Its electrical in, electrical out Optical used to be binary, but now its QAM 64 7:50 Why do we have optical? 8:20 A need for long distance communication led to optical Communication lines used to follow train tracks, and there were huts every 80 km. So, signals could be regenerated every 80 km. In the 1990s, a new optical amplifier was introduced. 9:50 Reamplifcation vs regeneration 10:00 .1 dB per km loss in modern fiber optic cable 11:20 This enables undersea communication Undersea has to be very reliable How does undersea communication happen? 12:30 Usually consortiums. I-ME-WE - https://en.wikipedia.org/wiki/I-ME-WE SEA-ME-WE - https://en.wikipedia.org/wiki/SEA-ME-WE_5 AT&T was originally a network provider What is dark fiber? 14:30 Fiber is cheap, installation and right-of-way is expensive 15:00 What if fiber breaks? 16:00 Dark fiber can be used as a sensor 16:30 (change in refractive index) Water in fiber optic line is bad Anchors break fiber optic cable 17:30 Fiber optic cable can be made out of a lot of different things 18:15 Undersea fiber has to have some extra slack in the cable 18:30 Submarines inspect fiber optic cable 19:30 You can find breaks in the line using OTDR 21:00 Optical time domain reflectometry A distributed reflection means a mostly linear loss. The slope tells you the loss rate. Refractive index in fiber is about 1.5 Latency and delay 23:00 The main issue is the data processing, not the data transmission A lot of optical engineers started in RF engineering 24:00 Environmental factors influence the channel 25:00 Factors include temperature, pressure, and bends Recently, thunderstorms effected the fiber channel Distributed fiber sensing for drilling 26:15 Polarization in fiber 27:00 Polarization multiplexing Uses 194 THz, 50 nm windows Future challenges for optical 28:25 Its cost driven. Laying fiber is expensive, and when alll dark fiber is being used, you have to increase bandwidth on existing fiber. Shannon relation 30:00 Predictions 31:10 #Fiberoptic #opticalcommunication #optical101 #darkfiber #engineeringpodcast #podcast #electricalengineering #RF$

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