Reduction of errors due to source and meter in the nonlinearity test

Nonlinearity test is required for many products of various applications, such as in consumer and is difficult to rest when sources and meters are nonlinear. A novel method using digital signal processing (DSP) techniques is presented to reduce the errors introduced by nonlinear source and meter. It uses the Taylor series representation to model the nonlinearity of source, meter, and device under lest (DUT). The nonlinearity coefficients of the overall stages are distorted by the nonlinear source and meter. These coefficients can be corrected by the nonlinearity coefficients with the DUT bypassed; accordingly the errors introduced by the nonlinear source and meter are minimized.