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THS4567: THS4567 tina noise model

Part Number: THS4567

Plan to use the THS4567 in a charge amplifier mode.

How is the noise modeled in the THS4567 Tina model?

I wonder if the input differential current noise and input single ended current noise are correctly modeled vs VICM and ICM enable pin.

Running output noise simulation give me much more noise than expected.

I can share my schematic if needed.

  • Morning Christophe, 

    The THS4567 servo's its input common mode voltage by adding a CM current into the summing nodes, as shown in Figure 6.6, that current noise can be quite high as part of those current sources summing in. However, if I run the TINA model with current meters into the inputs and an output noise sim, this should give the input current noise and it does not appear that  much larger source of current noise is being modeled, you can add it externally but would need to adjust that for whatever CM current is being produced, 

    The fact that your output noise is pretty high is probably due to the normal peaking in the voltage noise term to the output - would need full schematic and design goals to proceed,