We proposed exponentiation conversion circuit utilizing weak inversion operation by circuit design using practical voltage input and output with reducing circuit area. Because conventional circuit used input and output signal current and needed to convert signal current to signal voltage, it is not practical. Conventional circuit enabled exponentiation conversion by converting input signal current logarithmically, amplifying by power exponent value and converting signal to current exponentially. In order to enable convert small signal current in weak inversion region to 8bit 256 steps signal voltage with 10 mV per step, it is necessary to mount a few MΩ current voltage conversion resistance and difficult to mount on IC. Therefore, we reduced area of current voltage conversion resistance by using mult step current mirror circuit to amplify current. In addition, we proposed method to suppress MOSFET area increasing as side effect with decreasing of current density and completed the IC design. Feasibility of this IC will be confirmed by prototype IC soon.
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