PREDISTORTION ARRANGEMENT USING MIXERS IN NONLINEAR ELECTRO-OPTICAL APPLICATIONS

摘要

A predistortion arrangement is described for using an input signal to drive a nonlinear device having a drive input. Initially, first means sample a porti on of the input signal. The sample portion of the input signal is introduced to at least one predistortion path including a mixer responsive to the sampled portion of the input signal for producing at least second order intermodulation products of the input signal. The second order intermodulati on products are conditioned. Combining means then combine the conditioned secon d order intermodulation products with the sampled input signal in a way which produces a predistorted drive signal compensated for second order distortion for use in driving the drive input of the nonlinear device. In one aspect, t he sampling means and the combining means may be provided using resistive networks. The use of the resistive networks eliminates the need for directional couplers incorporating magnetic components. Accordingly, the predistortion arrangement including the mixer and the resistive networks may be provided in the form of an integrated circuit.