| Alternatives to traditional full-custom analog/ mixed-signal application-specific integrated circuits (ASICs) are described. These novel approaches apply many of the concepts of deep-submicrometer digital structured arrays and fieldprogrammable gate arrays (FPGAs) to analog design and fabrication methodologies. Field-and mask-programmable analog architectures are compared and contrasted to the long-standing full custom approach. In addition, the impact of electronic design automation (EDA) tools, which are critical cost-effective, widespread deployment of these new approaches, is discussed.Finally, the changes in manufacturing and fabrication processes to support production of field-and mask-programmable analog/ mixed-signal devices will be presented.KEYWORDS | Analog structured array; automated place and route; electronic design automation (EDA); field-programmable analog array (FPAA); field-programmable gate array (FPGA); mask-programmable analog array; mixed-signal applicationspecific integrated circuit (ASIC); mixed-signal structured array; structured array; structured ASIC; switched capacitor circuits; viaconfigurable array (VCA) Manuscript