Accurate stability prediction of single-bit higher-order Δ-Σ modulators for Speech Codecs

摘要

Present approaches for predictudof Delta-Sigma (Δ-Σ) modulators are moudDC inputs. This poses limitations as practudof Δ-Σ modulators involve a wide rangeudthan DC such as speech, audio and multipudthe case for synthetically generated speeudany other signal, through the appropriatudmultiple sinusoids. In this paper, a quasi linear model that accurately predicts stability of single-loop 1-bit higher order (Δ-Σ) modulators for mulitple sinusoids is given. The results of this paper would enable optimization of the design of higher-order single-loop (Δ-Σ) modulators with increased dynamic ranges for various applications that deploy multiple sinusoidal inputs, as well as any general input signal constructed from multiple sinusoids.