Post AjxaxpDdEOzvZ2DaM4 by matthewvenn@chaos.social
 (DIR) More posts by matthewvenn@chaos.social
 (DIR) Post #AjxaxhpGiaLmdRlWuO by matthewvenn@chaos.social
       2024-07-09T09:16:22Z
       
       1 likes, 1 repeats
       
       Look at this cool interdigitated transistor! This is a way of building chonkier transistors by putting them in parallel. This one has 3 gates, 2 sources and 2 drains and can work at 5v.
       
 (DIR) Post #AjxaxkqnTMM613VICu by matthewvenn@chaos.social
       2024-07-09T09:16:38Z
       
       0 likes, 0 repeats
       
       I’m using it as part of a mixed signal ASIC project that will digitally synthesise a sine wave and then output the signal at 3.3v. You can explore the design in 3D here: https://gds-viewer.tinytapeout.com/?model=https://mattvenn.github.io/tt08-analog-r2r-dac-3v3/tinytapeout.gds.gltf
       
 (DIR) Post #AjxaxmoOBHcM6AOOjQ by matthewvenn@chaos.social
       2024-07-09T09:17:03Z
       
       0 likes, 0 repeats
       
       The top block is made with a suite of tools called OpenLane. It includes tools from @yosyshq OpenROAD and many more. About 300 logic cells are needed to create the 8 bit sine wave.  The transistors used in the cells are 10x smaller than my big level shifter transistor
       
 (DIR) Post #AjxaxpDdEOzvZ2DaM4 by matthewvenn@chaos.social
       2024-07-09T09:17:35Z
       
       0 likes, 0 repeats
       
       After the 1.8v digital signals get boosted to 3.3v by the level shifter, they are combined by the R2R dac to produce this super smooth sine wave at 3.3v.I will set the frequency to 30Hz and use it to shake the foundations with bass!
       
 (DIR) Post #AjxaxrzYvAWgAGetLE by th@social.v.st
       2024-07-09T10:09:47Z
       
       0 likes, 1 repeats
       
       @matthewvenn I recently learned that a high gain JFET is just five hundred smaller transistors in a trenchcoat. https://zeptobars.com/en/read/Toshiba-2SK369-low-noise-JFET
       
 (DIR) Post #AjxaxrzYvAWgAGetLF by matthewvenn@chaos.social
       2024-07-09T09:18:27Z
       
       0 likes, 0 repeats
       
       This design will be fabricated on #TinyTapeout 8 - which closes on September 6th.If you want to learn how to shake foundations with your own open source ASICs, sign up to my newsletter! https://www.zerotoasiccourse.com/newsletter/