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Transmission Lines with Pre-existing Charge

Posted on April 11, 2018 Written by Gregory Durgin Leave a Comment

In lecture TDT06, we explore how to analyzer a transmission line in a circuit with a pre-existing charge.  This material is important in the world of high-speed digital electronics, where logic pins that suddenly switch low or high can propagate peculiar transients on signal lines … even if they are only used to load an initially-charged line.

As a side note, my first preparation of this lecture led to the four basic equivalent circuits for time-domain transmission lines, summarized in the figure on the left.  These useful equivalents (specifically the general equivalent circuit) had never, to my knowledge, been reported in a textbook or subject paper before.  But the GT students found them particularly useful, especially for working the infamous sequencer problems.

Filed Under: Education

The World’s First Digital Radio System

Posted on April 9, 2018 Written by Gregory Durgin

Gregory D. Durgin, originally posted on WaveRacer.com

18 June 2001

The world’s first digital radio system was actually the world’s first radio system.  This article discusses the physics behind Marconi’s revolutionary communications scheme: coherer-based reception of Morse code.

[Read more…]

Filed Under: Education

Cascades and Fan-outs

Posted on April 6, 2018 Written by Gregory Durgin

A lecture on how to analyze transmission lines that cascade or fan-out in the time domain. Important for understanding how a gnarly circuit board rings and echoes at high frequencies.

Filed Under: Education

The Culture of Swimming

Posted on March 30, 2018 Written by Gregory Durgin

How a Trip to the Pool is a Microcosm of Life in Japan for a Gaijin

by Gregory D. Durgin, 1 May 2001

When I arrived in Japan, one of the first things I wanted to find was a good pool for swimming laps.  Swimming laps is one of the only forms of exercise I get as an engineer, so I enjoy any opportunity to blow off some steam (and some pounds) in a pool.  It helps to fight off the biyo biyo, which roughly translates into English as jiggling belly lard.  [Read more…]

Filed Under: Education

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Conference Watch

IEEE RFID 2021 (hybrid)
27-29 April 2021, Phoenix, AZ
Submission Deadline:  2 February 2021

IEEE IMS 2021 (hybrid)
6-11 June 2021, Atlanta, GA
Submission Deadline: 15 Dec 2021

IEEE ICC 2021
14-18 June 2021, Montreal, Canada
Submission Deadline:  20 Jan 2021

IEEE APS 2021
10-16 July 2021, Singapore
Submission Deadline:  15 Jan 2021

IEEE RFID-TA 2021
September 2021, Aveiro, Portugal
Submission Deadline:  June 2021

IEEE WiSEE 2021
10-12 October 2021, Cleveland, OH
Submission Deadline:  1 July 2021

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