op-amps & analog electronics, Analog to Digital Converters (ADC) and Digital to Analog Converters (DAC), Instrumentation Amplifiers, Multiplexer etc are used extensively in signal conditioning circuits.
Micro and Nano sclales in ASIC is mainly related to the packing density of transitors on a chip. How small/thin substrate you use in constructing a CMOS on chip defines these scale.
For signal conditioning of process parameters like Temperature, Flow, Level etc, should we use CMOS: Mixed-Signal Circuit & analog integrated circuits ??