公开(公告)号：US09912144B2

公开(公告)日：2018-03-06

申请号：US14477236

申请日：2014-09-04

Applicant: ANALOG DEVICES TECHNOLOGY

Inventor： Trevor Clifford Caldwell ,  Corey Petersen ,  David Nelson Alldred ,  Hajime Shibata

IPC: H03M1/12 ,  H02H7/12 ,  H03M3/00

CPC classification number: H02H7/12 ,  H03M3/30 ,  H03M3/36 ,  H03M3/464 ,  H03M3/484

Abstract: Delta-sigma modulators do not handle overload well, and often become unstable if the input goes beyond the full-scale range of the modulator. To provide overload protection, an improved technique embeds an overload detector in the delta sigma modulator. When an overload condition is detected, coefficient(s) of the delta sigma modulator is adjusted to accommodate for the overloaded input. The improved technique advantageously allows the delta sigma modulator to handle overload gracefully without reset, and offers greater dynamic range at reduced resolution. Furthermore, the coefficient(s) of the delta sigma modulator can be adjusted in such a way to ensure the noise transfer function is not affected.