in TINA-Ti are available Voltage/current noise generators to test circuit noise gain.
I use them according to the app note written by Art Kay and others. The generators .subckt are as it follows:
voltage noise .subckt
.SUBCKT VNSE 1 2
**************************
* BEGIN SETUP OF NOISE GEN - NANOVOLT/RT-HZ
* INPUT THREE VARIABLES
* NLF - NV/RHZ AT (1/F) FREQ
* FLW - FREQ FOR (1/F) VAL
* NVR - NV/RHZ FLATBAND
**************************
....
....
current noise .subckt
.SUBCKT FEMT 1 2
**************************
* BEGIN SETUP OF NOISE GEN - FEMPTOAMPS/RT-HZ
* INPUT THREE VARIABLES
* NLFF - SET UP INSE 1/F
* FLWF - FA/RHZ AT 1/F FREQ
* NVRF - FA/RHZ FLATBAND
**************************
...
...
as you can see, in both cases it possible to enter only 3 values.
For instance, the current noise generator needs:
(1/f noise value in fA/sqrt(Hz), 1/f freq in Hz) + noise in fA/sqrt(Hz) @ flatband
It is not clear to me how to choose the point (1/f noise value in fA/sqrt(Hz), 1/f freq in Hz)
in the (current noise density) vs. freq. plane
Moreover, with only one point given in the plane and just the flatband noise, the generator is not capable to model the noise in any arbitrary condition.
I am wondering whether you have available an advanced, more accurate, noise generator taking as input 5 values:
(1/f noise value in fA/sqrt(Hz), 1/f freq in Hz) @ arbitrary point, possibly at VERY low freq
+
(1/f noise value in fA/sqrt(Hz), 1/f freq in Hz) @ corner freq
+
1/f noise @ flatband
By having 2 points in the noise plane, it should be possible to model precisely the noise behavior below the 1/f corner freq.
Thank you for your help.
Kind Regards,
Alberto
