vlsi
Some examples of Very Large Scale Integrated circuits in done in fused glass. These are assembled from cut tiles of colored glass onto a transparent background (shown here on a white surface), then heated in a kiln until the layers fuse.
The basic feature size, λ, is about ¼ inch, or 6,350,000 nm. Space limitations mean they don't follow many design rules. Colors code for mterials - blue is metal, dark red is polysilicon. Green and orange (which came out nearly red) are N- and P- doped. Vias between layers are marked with iridescent tiles. The material pretty much limits me to three layers.
Warning: circuits have not been validated or tested. I am not a EE. No MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Actual size may vary.
xor.
Schmitt trigger.
adds positive feedback to debounce an input signal with some hysteresis.
inverter.
i had a few shards left over.
static ram.
two bits, with reflected layouts. looks like 6 transistors each.
mux
2 in - 1 out, using pass-transistors.
used a shorter fusing cycle on the glass, so layers are more distinct.
When I get a chance, I hope to add circuit diagrams overlaid on the components, as well as a logic diagram.
Here's what it looks like before fusing,
and in a window, after.
two bits
The two-bit sram (static ram), with overlaid diagrams. The bits are mirror images of each other, in a pattern repeated for a larger array. The diagram on the left shows transistors. The diagram on the right shows the bit implementation as a pair of inverters.
