公开(公告)号：US09800260B1

公开(公告)日：2017-10-24

申请号：US15343674

申请日：2016-11-04

Applicant: Analog Devices Global

Inventor： Debopam Banerjee

IPC: H04B1/38 ,  H03M3/00 ,  H03M1/12 ,  H04B1/00 ,  H03M1/00

CPC classification number: H03M3/412 ,  H03M1/124 ,  H03M3/452 ,  H03M3/454 ,  H03M3/458 ,  H03M3/488 ,  H04B1/0017 ,  H04B1/38

Abstract: An apparatus comprises a delta-sigma analog-to-digital converter (ADC) and baseband processing circuitry. The delta-sigma ADC includes a plurality of integrator stages connected in series, including a first integrator stage operatively coupled to an input of the delta-sigma ADC; a main quantizer circuit including a main ADC circuit and a main digital-to-analog converter (DAC) circuit, wherein an input to the main ADC circuit is operatively coupled to the plurality of integrator stages; and a first feedback circuit path operatively coupled from an output of the first integrator stage to the input of the delta-sigma ADC, wherein the first feedback circuit path is configured to subtract an output voltage of the first integrator stage from the input of the delta-sigma ADC. The baseband circuitry is configured to activate the first feedback circuit path when detecting that the input voltage increases to cause distortion in the delta-sigma ADC.