MITE circuits: the continuous-time counterpart to switched-capacitor circuits

Some new applications of a family of circuits using op-amps built with multiple-input translinear elements (MITE) circuits are discussed. These include weighted average circuits for resistive networks, defuzzifiers, FIRs, common-mode feedback networks, sigma-delta modulators, and fast digital converters (digital-analog and analog-digital). Some aspects of MITE circuits not reported before are discussed like gain-bandwidth tradeoffs and an analysis showing that the behavior of closed-loop MITE circuits is determined by accurately controllable capacitance ratios; to a first-order approximation it is not affected by the parasitic capacitances of the MOS transistor. From this point of view MITE circuits are considered here as the continuous-time counterpart to switched-capacitor circuits. Experimental results of two test chip prototypes are shown.