In semiconductor design, standard cell methodology is a method of designing application-specific integrated circuits (ASICs) with mostly digital-logic features.
Standard cell methodology is an example of design abstraction, whereby a low-level very-large-scale integration (VLSI) layout is encapsulated into an abstract logic representation (such as a NAND gate).
Analog IC design is used in the design of op-amps, linear regulators, phase locked loops, oscillators, and active filters. Analog design is more concerned with the physics of semiconductor devices such as gain, matching, power dissipation, and resistance. Fidelity of analog signal amplification and filtering are usually critical and as a result, analog ICs use active devices with larger area than digital designs and are usually less dense in circuitry