Other Parts Discussed in Thread: TINA-TI, , LMH6514
Tool/software: TINA-TI or Spice Models
problem description:
I test the noise above circuit ,input Vi is connected to ground.
In the Two condtions,
1:when Vc is 0 V(VCA=0 dB),There is almost no noise.The minimum resolution of the oscilloscope is about 4 mV, and the current VPP display is 4 MV.
However, when the gain increases to 100 times
2.and Vc is -2V(VCA=40 dB)，The oscilloscope shows that the peak value of VPP is 7-8 VPP.
Through this comparison, can we consider that the minimum recognition input signal resolution of the device is 30 ~ 40 uV?
In our application, the minimum acquisition signal is uV. According to this test, our effective signal is unrecognizable? I don't know what's wrong, or is this the case with the chip?
Seek help！
