Linear composite MOSFETs (COMFETs)

MOS linear circuit design remains a challenging task due to the nonlinear characteristics of the MOSFET. A generalised method of designing MOS linear circuits making use of linear composite MOSFET (COMFET) circuit structures as versatile basic circuit building blocks is described. The COMFET is linear in its composite-rain current and in its composite-source current with respect to its composite-gate-source voltage, assuming the square-law saturated drain current characteristic of the MOSFET.