CS-resNoise
* file: CS-resNoise.cir
* SPICE (SIMetrix) circuit file
.lib CMOS18-1.lib
C1 1 0 1
E1 2 0 1 0 1k
V1 3 2 0
R1 3 4 600
M1 5 4 0 0 C18nmos L=180n W={W}
V2 5 6 0.9
R2 6 1 1meg
I1 0 6 {W*6.15m/54.6u}
.param W=54.6u
* instruction for plotting source referred noise spectrum
* over a frequency range from 100MHz to 100GHZ
.noise V(5) V1 Dec 25 100meg 100G
.graph "inoise"
+ xlog="log"
* instruction for plotting the figure noise versus the width
* over a frequency range from 1GHz to 5GHZ
.noise V(5) V1 Lin 25 1G 5G 1 SWEEP PARAM=W LIN 100 10u 100u
* Plot the noise figure NF
* NF = 20*log(total_onoise/contribution_of_R1_in_total_onoise)
* SIMetrix: 20*log(Sumnoise(onoise)/SumNoise(R1#noise))
.graph "XY(20*log((SumNoise(onoise))[][0]/(SumNoise(R1#noise))[][0] ),GetVecStepVals(V2#p))"
+ graphname="NF"
+ ylabel="NF"
+ yunit="dB"
+ curvelabel="Ids=W/54.6u*6.15m"
+ xlabel=W
+ xunit=m
.end