Guessing following cases: 1) Education 2) Synthesized analog functions: PLL, ADC, DAC, Filters, etc. 3) Do your own standard cells using a new kind of logic 4)

Guessing following cases: 1) Education 2) Synthesized analog functions: PLL, ADC, DAC, Filters, etc. 3) Do your own standard cells using a new kind of logic 4) Proof-of-concept for analog circuitry