Figure 2.

Clocking scheme. The clock cycle governing the pipeline transmission through a QCA. It is based on four phases, switch [0, <a onClick="popup('http://www.nanoscalereslett.com/content/7/1/221/mathml/M1','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/7/1/221/mathml/M1">View MathML</a>), hold [<a onClick="popup('http://www.nanoscalereslett.com/content/7/1/221/mathml/M2','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/7/1/221/mathml/M2">View MathML</a>), release [<a onClick="popup('http://www.nanoscalereslett.com/content/7/1/221/mathml/M3','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/7/1/221/mathml/M3">View MathML</a>), and relax [<a onClick="popup('http://www.nanoscalereslett.com/content/7/1/221/mathml/M4','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/7/1/221/mathml/M4">View MathML</a>, 1). Indices 0–3 indicate the clock zones, governed by a phase shifted original clock signal C0, so that when a cell in clock zone 0 is in the hold phase, a cell in clock zone 1 is in the switch phase, a cell in clock zone 2 is in the relax phase, and a cell in clock zone 3 is in the release phase.

Bajec and Pečar Nanoscale Research Letters 2012 7:221   doi:10.1186/1556-276X-7-221
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