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Hi Anshuman,
The answer is all the "unsexy" applications which don't need a ton of compute - automotive, industrial, controls, aerospace, etc.
On most modern 180nm nodes you get logic, analogue and high voltage (200V) design blocks, combined with low mask and wafer costs.
Lets say you needed...
Hi Arthur,
These betavoltaic batteries have been on the market for a decade or so - usually in order to use SRAMs as non-volatile storage, or combined with a large cap to supply devices with long sleep times and short periodic wake cycles.
Current suppliers are offering 50-100µW or so power...