This work 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 for circuits implemented in a CMOS 1.5- mu m process technology are shown to demonstrate the design flexibility of the approach.
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