{"id":3004,"date":"2011-06-24T20:21:46","date_gmt":"2011-06-24T20:21:46","guid":{"rendered":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/?p=3004"},"modified":"2011-07-19T19:24:21","modified_gmt":"2011-07-19T19:24:21","slug":"a-low-voltage-digitally-assisted-analog-front-end-ic-for-a-wearable-ecg-monitor-2","status":"publish","type":"post","link":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/a-low-voltage-digitally-assisted-analog-front-end-ic-for-a-wearable-ecg-monitor-2\/","title":{"rendered":"A Low-Voltage Digitally-Assisted Analog Front-End IC for a Wearable ECG Monitor"},"content":{"rendered":"
\"Figure<\/a>

Figure 1: System block diagram of the fully-integrated low-voltage AFE. The mixed-signal feedback loop comprises the analog circuits shown in white and digital processing shown with the shaded blocks. <\/p><\/div>\n

Circuits for wearable vital sign monitors have very stringent requirements on power dissipation due to limited energy storage capacity.\u00a0 Extending the time between battery recharge or device replacement requires low-power circuits.\u00a0 This work focuses on the design of a fully-integrated, low-voltage, digitally-assisted analog front-end (AFE) for ambulatory ECG monitoring, and it builds on work described in [1<\/a>] <\/sup>.\u00a0 The power consumption of an AFE is often determined by dynamic range (DR) requirements.\u00a0 For bio-potential acquisition, the high end of the DR requirement is often set by interference such as 50\/60-Hz power-line interference (PLI) [2<\/a>] <\/sup>.\u00a0 Here, a mixed-signal interference cancellation loop is used to cancel PLI right at the input of the system, thus reducing the DR requirement to enable low-voltage operation.\u00a0 The fully-integrated AFE shown in Figure 1 leverages techniques such as oversampling, digital processing, and delta-sigma noise shaping to reduce the system area and power.\u00a0 A target supply voltage of 0.6V provides power savings from voltage scaling and ensures compatibility with state-of-the-art digital signal processors [3<\/a>] <\/sup> to reduce system complexity.<\/p>\n<\/div>

  1. J. L. Bohorquez, M. Yip, A. P. Chandrakasan and J. L. Dawson, \u201cA digitally-assisted sensor interface for biomedical applications,\u201d in Proc. IEEE Symp. on VLSI Circuits<\/em>, Jun. 2010, pp. 217-218. [↩<\/a>]<\/li>
  2. E. M. Spinelli and M. A. Mayosky, \u201cTwo-electrode biopotential measurements: Power line interference analysis,\u201d IEEE Trans. Biomedical Engineering<\/em>, vol. 52, no. 8, pp. 1436-1442, Aug. 2005. [↩<\/a>]<\/li>
  3. J. Kwong and A. P. Chandrakasan, \u201cAn energy-efficient biomedical signal processing platform,\u201d in Proc. IEEE European Solid-State Circuits Conference<\/em>, Sep. 2010, pp. 526-529. [↩<\/a>]<\/li><\/ol>","protected":false},"excerpt":{"rendered":"

    Circuits for wearable vital sign monitors have very stringent requirements on power dissipation due to limited energy storage capacity.\u00a0 Extending…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[26,5530],"tags":[17,4151],"_links":{"self":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts\/3004"}],"collection":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/comments?post=3004"}],"version-history":[{"count":3,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts\/3004\/revisions"}],"predecessor-version":[{"id":4063,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts\/3004\/revisions\/4063"}],"wp:attachment":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/media?parent=3004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/categories?post=3004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/tags?post=3004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}