ABSTRACT
This chapter investigates the quantization effect on vibration rejection capability of the closed-loop control system. With a proposed quantizer model, the influence of different quantizer bits on the error rejection ability in low frequency range is analyzed and evaluated based on frequency response measurement. The chapter discusses the development of a simple and low cost scaling scheme to compensate for the effect of the quantizer. It focuses on the effect of quantizer on the sensitivity function and seeks to differentiate the quantization and friction nonlinearity effect. The chapter investigates how the quantizer with different bits affects the error rejection function, and shows that the lower low-frequency disturbance rejection reflected in the sensitivity function may also be caused by quantization in addition to friction. A scaling method is used to compensate for the effect of the quantizer on the sensitivity function at low frequencies.
