Mar 4, 2015 #1 E electronics20 Full Member level 1 Joined Apr 27, 2011 Messages 99 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Activity points 1,888 Dear scholars In subthreshold region, why does the standard deviation of Vth decreases when length of transistors increases? Thanks in advance
Dear scholars In subthreshold region, why does the standard deviation of Vth decreases when length of transistors increases? Thanks in advance
Mar 4, 2015 #2 erikl Super Moderator Staff member Joined Sep 9, 2008 Messages 8,108 Helped 2,695 Reputation 5,370 Reaction score 2,305 Trophy points 1,393 Location Germany Activity points 44,123 The Pelgrom equation shows that ΔVth is inversely proportional to the square root of the gate dimensions W*L: ΔVth ~ (WL)-1/2. For more explanation, s. these 2 pages from Binkley's book "Tradeoffs and Optimization in Analog CMOS Design": View attachment Vth_standard_deviation_dependency_on_gate_length.pdf .
The Pelgrom equation shows that ΔVth is inversely proportional to the square root of the gate dimensions W*L: ΔVth ~ (WL)-1/2. For more explanation, s. these 2 pages from Binkley's book "Tradeoffs and Optimization in Analog CMOS Design": View attachment Vth_standard_deviation_dependency_on_gate_length.pdf .