Electronic – What components can an FPGA replace/emulate


I've been under the impression that FPGAs were merely, well, field-programmable gate arrays, but I've seen some example schematics with resistors, capacitors, and such in them. As such, can an FPGA serve only as a replacement for 7400-series ICs, or also for resistors or other passive components?

Best Answer

FPGAs can replace digital logic as well as (in mixed-signal FPGAs) a few analog components (mostly larger bits like ADCs/DACs, comparators, PLLs, etc.).

The analog/passive equivalent is the FPAA, and there are a few examples already in existence such as Lattice Semiconductor's ispPAC line.