Problem 2.14

Problem 2.14

1. Schematic

2. HSPICE Netlist

* Problem 2.14

 

* MOS model
.include p18_cmos_models_tt.inc

 

* main circuit
mn1 1 2 0 0 nmos L=0.2u W=20u

 

* voltage source
vdd 1 0 1.8
vgs 2 0 dc 0.613 ac 1
** vgs dc value adjusted to ensure Id is 0.5mA
 

* analysis
.op
.ac dec 100 1k 100G
 

* options
.options post

 

*slow version
.alter
.include p18_cmos_models_ss.inc
.param vt_shift = 0
vgs 2 0 dc 0.624 ac 1

** vgs dc value adjusted to ensure Id is 0.5mA
.end

3. Simulation Result

 

Variation fT [GHz] ΔId [%]
Typical 18.7 0
VCox: -5%
µn: -10%
17.8 -4.8

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