公开(公告)号：US09287839B1

公开(公告)日：2016-03-15

申请号：US14056108

申请日：2013-10-17

Applicant: Cirrus Logic, Inc.

Inventor： Christophe Jean-Francois Amadi ,  Jason Lee Wardlaw ,  Emmanuel A. Marchais ,  Dylan Alexander Hester ,  Daniel John Allen ,  John Christopher Tucker

IPC: H03F3/45 ,  H03F1/34 ,  H03F1/02 ,  H03G3/32

CPC classification number: H03F3/45659 ,  H03F1/02 ,  H03F1/26 ,  H03F1/34 ,  H03F3/187 ,  H03F3/45475 ,  H03F3/45753 ,  H03F2200/03 ,  H03F2203/45138 ,  H03F2203/45212 ,  H03F2203/45526 ,  H03F2203/45586 ,  H03G3/32

Abstract: A DC servo loop may track DC offset changes of an input signal and apply feedback to amplifiers to adjust a DC offset of the input signal. The DC servo loop may include digital loop tracking and analog loop tracking components. The digital loop tracking components may track small changes in the DC offset. When the DC offset exceeds a certain threshold, analog loop tracking may be activated to apply feedback to the amplifiers to adjust the DC offset. The adjustments to the DC offset may be delayed until an amplitude of the input signal exceeds a threshold to reduce contribution to noise in the input signal.

Abstract translation: DC伺服环路可以跟踪输入信号的DC偏移变化，并将反馈应用于放大器以调整输入信号的直流偏移。 DC伺服环路可以包括数字环路跟踪和模拟环路跟踪组件。 数字环路跟踪组件可以跟踪DC偏移的小变化。 当DC偏移超过某个阈值时，可以激活模拟环路跟踪以将反馈应用于放大器以调整DC偏移。 DC偏移的调整可能被延迟，直到输入信号的幅度超过阈值以减小输入信号中对噪声的贡献。