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OPA355 and OPA227 : noise information in macro view of TINA simulation

Other Parts Discussed in Thread: OPA355

Hello this is seongmun kim
nowaday, i am running to simulation about noise analysis.
but example noise information in macro is not correct for analysis.
can i share the inforamtion about noise component for OPA355, 380?
each information of noise modeling for opamp is difference.
and some product has a different behavior on noise current density as OPA355 and OPA 227. in case of it, how can i get the noise information by macro viewer? 

i uploaded noise information on curent noise source of opa355. 

current noise source by macro source.txt
* BEGIN PROG NSE FEMTO AMP/RT-HZ 
.SUBCKT FEMTO 1 2
* BEGIN SETUP OF NOISE GEN - FEMPTOAMPS/RT-HZ
* INPUT THREE VARIABLES
* SET UP INSE 1/F
* FA/RHZ AT 1/F FREQ
.PARAM NLFF=1.2
* FREQ FOR 1/F VAL
.PARAM FLWF=0.001
* SET UP INSE FB
* FA/RHZ FLATBAND
.PARAM NVRF=1.2
* END USER INPUT
* START CALC VALS
.PARAM GLFF={PWR(FLWF,0.25)*NLFF/1164}
.PARAM RNVF={1.184*PWR(NVRF,2)}
.MODEL DVNF D KF={PWR(FLWF,0.5)/1E11} IS=1.0E-16
* END CALC VALS
I1 0 7 10E-3
I2 0 8 10E-3
D1 7 0 DVNF
D2 8 0 DVNF
E1 3 6 7 8 {GLFF}
R1 3 0 1E9
R2 3 0 1E9
R3 3 6 1E9
E2 6 4 5 0 10
R4 5 0 {RNVF}
R5 5 0 {RNVF}
R6 3 4 1E9
R7 4 0 1E9
G1 1 2 3 4 1E-6
C1 1 0 1E-15
C2 2 0 1E-15
C3 1 2 1E-15
.ENDS
* END PROG NSE FEMTO AMP/RT-HZ

  • Hi Seongmun,

    When we model current noise, we adjust NLFF, FLWF, and NVRF. The image below highlights what the variables are based off of. For the OPA355 and most CMOS devices, the current noise is in the femtoampere region which we sometimes model by keeping NLFF and NVRF the same. We also have a Precision labs video that gives a quick overview of how to do this from scratch. However, the same idea can be applied if you adjust the values in the OPA355 macro model. The Precision labs series can be found here. The video can be found under the noise section, and it is titled "Verifying the noise model".

    Best Regards,

    Ignacio