A programmable current mirror for analog trimming using single poly floating-gate devices in standard CMOS technology

This paper describes a programmable current mirror comprised of single-poly floating-gate devices. By programming the threshold voltage of the floating-gate devices, a current mirror's input-output current mismatch can be trimmed at a desired current level. This programmability allows accurate drain current matching to be achieved without using large gate area devices. A prototype of the programmable current mirror fabricated in a 0.5-micron digital CMOS technology achieves 0.04% input-output current matching.