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4 Key Parameters and Informational Parameters

 The primary performance parameters and the qualification parameters used for pass/fail decisions are listed in Table 2. The numbers in the `source' column refer to the required device simulations (cf. Table 1). It is important to note, that the threshold voltage does not appear in this list, nor is it needed in any other way. However, as the threshold voltage is a very vivid and popular parameter VT,lin has been added to a list of so-called informational parameters, i.e., quantities that are only indirectly linked to performance and sensitivity (cf. Table 3). For all parameter definitions that require arbitrary threshold currents (such as for VT,sat, Vpunch [4]) one unique characteristic current IT is extracted from data set 5b by extrapolating log(ID) to VD=0V.


  
Table 2: System performance and qualification parameters
  parameter source
td inverter delay 1, 3
Es switching energy 1, 2, 3
fc,max maximum clock frequency 1, 3
fc,min minimum clock frequency 2, 3
NM normalized noise margins 4
OS normalized output voltage swing 2, 5a
Ainv inverter gain 4


  
Table 3: Informational parameters
  parameter source
Ion turn-on current 1
Ioff turn-off current 2
VT,lin linear threshold voltage 5
VT,sat saturation threshold voltage 4a
IT threshold current 5
Rdibl surface DIBL rate 2
Rpunch sub-surface DIBL rate 2
Vpunch punch-through voltage 2, 5b


next up previous
Next: 5 Dynamic Inverter Model Up: VLSI Performance Metric Based Previous: 3 Device Simulation

G. Schrom, V. De, and S. Selberherr: VLSI Performance Metric Based on Minimum TCAD Simulations