Higher order sliding mode design for Sigma-Delta modulator

A high order sliding mode approach to design high order Sigma-Delta modulator is introduced because of the high order sliding mode has higher accuracy than the traditional one (one order sliding mode). Under design, the higher order Sigma-Delta modulator is regarded as a nonlinear dynamic system with feedback control, and is further divided into an object controlled and controller. Then the controller is designed by using the higher order sliding mode method. As an example, a three-order Sigma-Delta demodulator with 2-sliding mode is designed, and the result demonstrates that the modulator design based on the high order sliding mode has the higher rate of signal-to-noise and smaller quantized noise.