INIS: A Family of ΔΣ Modulators With Inherent Spur Immunity When Interacting With a Static Nonlinearity

Digital ΔΣ modulators (DDSM) are used in applications that require a reduction of the wordlength of a digital signal. In the presence of non-idealities, the quantization error of the DDSM can interact with nonlinearities further along the signal chain and generate spurious tones in addition to excess noise. This paper introduces the INIS family of DDSMs that are inherently immune from nonlinearity-induced spurs. Some representative members of the family are analyzed through simulations; one is demonstrated with a hardware implementation. Their performances are compared with those of other well-known DDSM architectures.