Abstract

. We describe a family of current-mode circuits with multiple inputs and multiple outputs whose output currents are products and/or quotients of powers of the input currents. These circuits are made up of multiple-input floating-gate MOS (FGMOS) transistors operating in the subthreshold regime. The powers are set by capacitor ratios; hence, they can be quite accurate. We analyze the general family of such circuits and present experimental data from several members that we fabricated in a standard 2¯m double-poly p-well process through MOSIS. 1. Introduction Information processing using analog VLSI systems has recently become the subject of much interest and active research [1], [2]. In particular, the current-mode approach is the focus of much attention [3]. In this paradigm, the quantities of interest are represented by currents, whereas the circuit voltages are thought of as playing only an incidental role. Among the vast array of nonlinear operations required to perform current-mod...

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