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<p>[QUOTE=&quot;akeady, post: 4340476, member: 83175&quot;]I chopped down most of a bush in front of the house today - it&#039;s been on the &quot;To Do&quot; list for ages and coming back from bringing in the rubbish bin this morning it caught my eye.&nbsp;&nbsp; I&#039;ll need a skip now to remove the remains (and some junk from the back).&nbsp;&nbsp; I even mowed the lawn yesterday, so this might be a productive time.</p><p><br /></p><p>Here&#039;s something interesting I found last night - a box with three of these in it - my third chip, from 1996:</p><p><br /></p><p>[ATTACH=full]1099710[/ATTACH] </p><p><br /></p><p>It&#039;s a bandpass Sigma-Delta ADC - it chops the input to DC and has an analogue FIR filter and then digitizes the filtered signal using two second-order Sigma-Delta ADCs, giving I&amp;Q outputs.&nbsp;&nbsp; If I can kludge together up a clock and power supply, I&#039;ll try it.</p><p><br /></p><p>It was on a 2.4um process, which was old even then and is nearly prehistoric now - our last chip at work was on 28nm and we&#039;ve done 10nm and 12nm chips in the last couple of years.&nbsp;&nbsp; The numbers refer to the minimum feature sizes - a transistor gate length or a metal track - so 28nm could have gates about 1/86th the length of a 2.4um technology.&nbsp;&nbsp; If everything scaled, you could get ~7300 times as many devices in the same area on 28nm as on 2.4um.&nbsp;&nbsp; There were only two metal layers here; nowadays, we might have ten layers.</p><p><br /></p><p>I have two older chips somewhere around the house that further Covid-induced cleaning may throw up <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></p><p><br /></p><p>ATB,</p><p>Aidan.[/QUOTE]</p><p><br /></p>

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