div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: cs230stanfordedu · Despite its widespread usage PPG technology continues to suffer from two main issues: motion artifact MA noise and power consumption MA from walking running src=https:reader034vdocumentinreader034viewer20220422035ea3925fea729c19fe1a0d6bhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: cs230stanfordedu · Despite its widespread usage PPG technology continues to suffer from two main issues: motion artifact MA noise and power consumption MA from walking running src=https:reader034vdocumentinreader034viewer20220422035ea3925fea729c19fe1a0d6bhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: cs230stanfordedu · Despite its widespread usage PPG technology continues to suffer from two main issues: motion artifact MA noise and power consumption MA from walking running src=https:reader034vdocumentinreader034viewer20220422035ea3925fea729c19fe1a0d6bhtml5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 4button div class=ts-image amp-img class=ts-thumb alt=Page 4: cs230stanfordedu · Despite its widespread usage PPG technology continues to suffer from two main issues: motion artifact MA noise and power consumption MA from walking running src=https:reader034vdocumentinreader034viewer20220422035ea3925fea729c19fe1a0d6bhtml5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 5button div class=ts-image amp-img class=ts-thumb alt=Page 5: cs230stanfordedu · Despite its widespread usage PPG technology continues to suffer from two main issues: motion artifact MA noise and power consumption MA from walking running src=https:reader034vdocumentinreader034viewer20220422035ea3925fea729c19fe1a0d6bhtml5thumbnails5jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 6button div class=ts-image amp-img class=ts-thumb alt=Page 6: cs230stanfordedu · Despite its widespread usage PPG technology continues to suffer from two main issues: motion artifact MA noise and power consumption MA from walking running src=https:reader034vdocumentinreader034viewer20220422035ea3925fea729c19fe1a0d6bhtml5thumbnails6jpg width=142 height=106 layout=responsive amp-img divdiv