Referring to elog entry 2385. I did the measurements again because mistakingly I had been using the SR560 with it's AC supply on. This time I used the 12V supply with no connection to the AC supply.
**Attachment 1: The Circuit Diagram TIA**
>> the TIA with a gain of 5.1k
**Attachment 2: Input Referred noise of TIA **
The input-referred current noise across the TIA was measured using SR785 and was compared against the graph obtained from ZERO simulation.
**Attachment 3: Differential Circuit**
>> gain of 100
**Attachment 4: Input Referred noise of Differential Circuit**
The input-referred voltage noise measured using SR785 and was compared against the graph obtained from ZERO simulation.
**Attachment 5: Whitening Filter Circuit**
>> gain of 10
**Attachment 6: Input Referred noise of Whitening Filter Circuit**
The input-referred voltage noise was measured using SR785 and was compared against the graph obtained from ZERO simulation.
**Attachment 7: The Scripts**
All the scripts and data used in the measurement.
** I did notice a reduction in 60Hz harmonics but I still see a deviation from simulated results at higher frequencies and at frequencies below 10Hz. |