Amplitude Quantization

In this chapter, the picture of the digital nature of the control modeled and discussed only in terms of time quantization, is completed by examining amplitude quantization effects. This chapter is devoted to explaining how limit cycling arises in relation to the existence of a steady-state solution in a digitally controlled converter with A/D and digital pulse width modulator (DPWM) quantizations. Quantization characteristics are summarized, and the problem of finding a steady-state solution in a digitally controlled converter is discussed. The chapter reviews some of the techniques targeting high-resolution DPWM and A/D implementations, and summarizes the key points. It also reviews the amplitude quantization characteristics of the A/D converter and the DPWM in the digital control loop. The focus is on the amplitude quantization effects. The chapter also reviews some of the DPWM and A/D implementation techniques in the context of high-frequency digitally controlled switched-mode power converters.