cascaded buffers

to drive a high fanout node we prefer a cascaded chain of inverters and not non-inverting buffers...why? this was the question put to me in an interview and the person asked me to explian using tphl and tplh concepts.....i finally answered him giving some waveforms that the clock skew would become worse in the latter case...was i correct????

Asked By: mahesh_2006
On: Sep 3, 2005 4:43:07 AM

Comments(3)

Hi, Since cascading Inverters will become even number of buffers. The reason behind having repeaters or buffers in net is to drive the slew which would have got degraded due to long net. When you actually do the real P&R we decide to buffer depending on the net length.

Comment By: arunbuddy36
On: May 19, 2010 12:45:39 AM

1.Non inverting buffers require more number of transistors. 2. Basically in cascaded chain of inverters we keep increasing the W/L of consecutive stages which is responsible for increasing current drive. This can be done in an area efficient manner by using inverters instead of non-inverting buffers.

Comment By: rlnmanirln
On: Feb 14, 2010 1:00:28 PM

cascaded inverters (even no.) construct buffer only.

Comment By: venkateshr
On: Sep 6, 2005 2:00:00 AM

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