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The principle behind the method is based on a procedure that extends the integration time by periodically interrupting the normal integration of the filter. The net result is an up scaling of the time constant, inversely proportional to the switching duty\u2010cycle. This is particularly suitable for reducing the area occupied by passive devices in integrated circuits, as well as to accurately calibrate the filter dynamics. Previous works have been following this concept in an entirely continuous\u2010time perspective, either focusing on specific circuits or using approximations to provide an extended analysis. This paper includes input\/output sampling to derive a closed\u2010form representation for the scaling technique herein coined as \u2018Filter &amp; Hold\u2019 (F&amp;H). A detailed mathematical analysis is described, demonstrating that the F&amp;H concept represents an exact filtering solution. Simulation results and experimental measurements are provided to further validate the theoretical analysis for an F&amp;H vector\u2010filter prototype. Copyright \u00a9 2014 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/cta.2046","type":"journal-article","created":{"date-parts":[[2014,11,12]],"date-time":"2014-11-12T05:06:43Z","timestamp":1415768803000},"page":"1832-1844","source":"Crossref","is-referenced-by-count":0,"title":["Filter &amp; hold: a mixed continuous\u2010\/discrete\u2010time technique for time\u2010constant scaling"],"prefix":"10.1002","volume":"43","author":[{"given":"V\u00edtor Grade","family":"Tavares","sequence":"first","affiliation":[{"name":"INESC TEC (formerly INESC Porto) and Faculty of Engineering University of Porto  Portugal"}]},{"given":"C\u00e2ndido","family":"Duarte","sequence":"additional","affiliation":[{"name":"INESC TEC (formerly INESC Porto) and Faculty of Engineering University of Porto  Portugal"}]},{"given":"Pedro","family":"Guedes de Oliveira","sequence":"additional","affiliation":[{"name":"INESC TEC (formerly INESC Porto) and Faculty of Engineering University of Porto  Portugal"}]},{"given":"Jos\u00e9 Carlos","family":"Pr\u00edncipe","sequence":"additional","affiliation":[{"name":"Computational NeuroEngineering Laboratory University of Florida  USA"}]}],"member":"311","published-online":{"date-parts":[[2014,11,11]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/cta.745"},{"issue":"12","key":"e_1_2_8_3_1","first-page":"1391","article-title":"A 60\u2010dB dynamic\u2010range CMOS sixth\u2010order 2.4\u2010Hz low\u2010pass filter for medical applications. 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