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ORAssistant_RAG_Dataset
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      <p class="img-subscript">First Example</p>
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      <a href="t9_full.gif"><img src="thumb_t9_full.gif" border="0"/></a>
      <a href="t9_inv.gif"><img src="thumb_t9_inv.gif" border="0"/></a>
      <a href="t9_zoom.gif"><img src="thumb_t9_zoom.gif" border="0"/></a>
      <a href="t9_descend.gif"><img src="thumb_t9_descend.gif" border="0"/></a>
      <a href="t9_l1.gif"><img src="thumb_t9_l1.gif" border="0"/></a>
      <a href="t9_meas.gif"><img src="thumb_t9_meas.gif" border="0"/></a>
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      <p class="img-subscript">Second Example</p>
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      <a href="t10_full.gif"><img src="thumb_t10_full.gif" border="0"/></a>
      <a href="t10_inv2.gif"><img src="thumb_t10_inv2.gif" border="0"/></a>
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For a full view, click on the screenshot images.
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<p>
The first example is a simple design consisting of 20 inverter cells lined up 
and connected with their outputs to the inputs of the next. 
The feedback connects the output of the second-last inverter to
the input of the first. The last inverter is used as a buffer for 
the output signal. 
</p>
<p>
Since we use a odd number of inverters, there is no static state the 
circuit can settle to. Instead, the circuit will start to oscillate 
with a frequency determined by the delay of the inverters. 
</p>
<p>
For practical purposes however, one would need a more elaborate design. 
Please note, that this is a hypothetical and not a real-world design.
</p>

<p class="img-title">
This screenshot shows the design in full view:
</p>
<p>
<a href="t9_full.gif"><img src="t9_full.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows the single inverter cell:
</p>
<p>
<a href="t9_inv.gif"><img src="t9_inv.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows a zoomed view of the full circuit:
</p>
<p>
<a href="t9_zoom.gif"><img src="t9_zoom.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows the "inv" cell in the context of the "ringo" top cell.
The shape that "Descend" was applied to is highlighted.
</p>
<p>
<a href="t9_descend.gif"><img src="t9_descend.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows the top level only. Note how the inverter
cells are connected:
</p>
<p>
<a href="t9_l1.gif"><img src="t9_l1.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows a partial view with some measurements:
</p>
<p>
<a href="t9_meas.gif"><img src="t9_meas.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows a partial view with transparent layers:
</p>
<p>
<a href="t9_transp.gif"><img src="t9_transp.gif" border="0" width="338" height="317"/></a>
</p>

<h2>Second example</h2>

<p>
The second example is the same circuit with a area optimized layout.
In this example, two inverters are made into a single cell sharing the 
source contacts with each other. This way, one transistor spacing is 
saved. The price to pay is the larger height required for the wiring.
</p>

<p class="img-title">
This screenshot shows the design in full view:
</p>
<p>
<a href="t10_full.gif"><img src="t10_full.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows the single dual-inverter cell:
</p>
<p>
<a href="t10_inv2.gif"><img src="t10_inv2.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows a zoomed view of the full circuit:
</p>
<p>
<a href="t10_zoom.gif"><img src="t10_zoom.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows the top level only. Note how the inverter
cells are connected:
</p>
<p>
<a href="t10_l1.gif"><img src="t10_l1.gif" border="0" width="338" height="317"/></a>
</p>

<p class="img-title">
This screenshot shows both designs loaded into the same view.
The area advantage of the area-optimized design is clearly visible:
</p>
<p>
<a href="t9+10.gif"><img border="0" src="t9+10.gif" width="338" height="317"/></a>
</p>


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