I am planning to collect design topics here having to do with ASIC, PCB, firmware and general engineering. I have spent the last 20 years or so working on electronic engineering and acting as a consulting engineer for two companies. We are collectively engaged in creating and marketing rotary and linear position sensors that are used in robotics.
This photo shows two small ASICs that are used to make a capacitive positioning sensor.
The packages are 3x3 mm QFN (Quad Flat Nolead packages).