Tool/software:
Dear TI E2E support,
I try to verify the OPA189 voltage noise against the datasheet.
For gain=11, the noise measured by my measurement system is about right to the spec. My measurement system has 1/f noise, the above circuit does not add noise to the 1/f part. The broadband noise is a little under 6 nv/√Hz. My measurement system has noise value of a little less than 4nv/√Hz.
For this unity gain setting, my measured noise is about 15nv/√Hz from 3Hz up to 80Khz (this is my measurement system bandwidth).
The Tina simulation tells me that the noise should still be about 5.2 nv/√Hz. We certainly expect the noise as: no 1/f noise and broadband noise is 5.2 nv/√Hz.
Could you please help?
George