Nonlinearity compensation circuit and method, control circuit and method for nonlinearity compenstation circuit and recording and/or playback apparatus employing the same

摘要

A nonlinearity compensation circuit is disclosed which includes an inverse hyperbolic function generation circuit for converting differential currents corresponding to input signals in+ and in- into differential voltages which increase in proportion to an inverse hyperbolic function, an offset provision circuit for providing an offset corresponding to control signals c+ and c- to the differential voltages outputted from the inverse hyperbolic function generation circuit and a hyperbolic function generation circuit for converting the differential voltages to which the offset has been provided by the offset provision circuit into signals which increase in proportion to a hyperbolic function and outputting the resulting signals as output signals out+ and out-. Consequently, compensation for the nonlinearity such as second order distortion can be performed for the read signal from a recording medium.