Aydin Vector TC-801
Microscope view of trimmed resistor array, on smaller (transparent) substrate. The vertical notches in the large black sections are the trimming marks where a laser was used to adjust the resistances.
I'm not sure what the strange-shaped structures in the bottom-left and bottom-right are for. I have vague memories of someone once explaining that they were used for low-thermal-coefficient / low-voltage-coefficient resistances, but that could be something different.
Analysis: www.eevblog.com/forum/projects/de-capping-circuit-analysi...
Aydin Vector TC-801
Microscope view of trimmed resistor array, on smaller (transparent) substrate. The vertical notches in the large black sections are the trimming marks where a laser was used to adjust the resistances.
I'm not sure what the strange-shaped structures in the bottom-left and bottom-right are for. I have vague memories of someone once explaining that they were used for low-thermal-coefficient / low-voltage-coefficient resistances, but that could be something different.
Analysis: www.eevblog.com/forum/projects/de-capping-circuit-analysi...