sa_penguin

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sa_penguin

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  • 10.24.2017
  • An overlay transistor cautionary tale
  • Wouldn't it be nice if SPICE parameters were included, in a table, in the data sheet? As compared to being spread out over multiple tables? Heck, I'd settle for H parameters (ok, and S parameters for RF) in a single table. "Misdirection through obfuscation" is a genuine problem.
  • 12.27.2017
  • EDN cartoons from the 1980s: Part 2
  • I heard of a "burn" to move a drifting satellite. The person reading the Fax missed the decimal point, resulting in a long burn that used a bucketload of fuel and moved the bird way out of position. After that, the word "point" was placed in all Fax instructions regarding burn duration.
  • 11.16.2016
  • Understanding and designing differential filters for communications systems
  • When it comes to PCB layout, it may be worth mentioning the pros and cons of putting each wire of a differential pair on a different layer. This can lead to stripline vs. microstrip, with the Analog Devices reference: http://www.analog.com/media/en/training-seminars/tutorials/MT-094.pdf
  • 09.27.2016
  • Demo board packs 50-Msample/s DAC
  • High speed connections can be a pain to implement - 50Msps is pretty good (although 120Msps would be my preference). Here's hoping for a follow-up ADC demo circuit.
  • 09.01.2016
  • Taking a look at non-imaging optics
  • Then there's opto isolators, and photodiodes detecting wheel movement in a mechanical mouse. Or fibre optic transmit / receive. Or even IR diodes, to illuminate those well-turned ankles without their owners being aware.
  • 03.26.2016
  • 4.3-in. LCDs complement single-board computers
  • I'm assuming the 12V is required for the LCD backlight. Nice product, but plays havoc with the power supply requirements of the target audience. The single board computers mentioned use a single 5VDC supply.
  • 02.25.2016
  • What good is state-of-the-art high-speed electronics without good connectivity?
  • Brilliant timing for that headline. The Raspberry Pi 3 has just been released with a better, faster processor - but the same old bottleneck I/O limitations (100M Ethernet vs gigabit, USB 2 vs 3, no SATA). Connectors like this would at least replace / improve the expansion interface, potentially allowing faster interfaces to work on a daughterboard.