LINEAR COMPOSITE MOSFET - THEORY, DESIGN, AND APPLICATIONS

This paper presents the theory, design, and applications of a new cell for MOS linear circuit design; the linear COMposite MOSFET (COMFET). The approach exploits the square-law saturated drain current equation of the MOSFET, and entails the design of a linear COMFET circuit, with both its drain and source currents linearly related to its gate-source voltage, as a basic linear circuit synthesis block. General applications including amplifiers, transconductors, filters, and multipliers using this block are described and measured results of the circuits implemented in a CMOS 1.5 mum process technology are shown to demonstrate the design flexibility of the approach.