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I'm not sure. Chopper-type opamp have higger Noise and unbalanced current to the input (toothy)-.
I need minim Power supply +-5V for example AD8638 have noise 66nV/Sqrt(Hz).
In an effort to construct a highly accurate DC amplifier ,amplifiers have found a solution that can gain up to 10.000x
ie 1.000 mV amplifes on 10.0000V, 10nV on 100uV. Amplifier work in measurement system with accuracy 0,5ppm. Construction is about 20 years old.
Honestly, construction has taken...
You consult amplifier, that would be comparable to or better than the LT1124. In particular, the fit slightly lower input current ~1 - 2nA.
I'm not allowed to use IC from Linear
https://www.linear.com/docs/1363
How, simple 500M ohm resistor + 7and 1/2 nanovolt mener.
Measure can be also flows around 10fA.
Details such as here.
https://www.analog.com/static/imported-files/tutorials/MT-038.pdf
Measured in air without PCB.
On 16pA measured +-2pA takes, measured piece had such input current and is in line...
Uncomfortable is
- +-13V power supply, I have +- 16V for other amplifier
- Input Bias Current datasheet say 10pA on 25C, I measure 16pA on 22C, hundreds of fA up to 1 pA would be better
input ofdset and noise id on the edge.
I need very precision PGA amplifier for 24bit ADC.
Input voltage 0-10V, gain 1x 10x 100x, input current < 10pA
I tried the AD8610 witch swichted resistor, but it would need something better
Can you advise?
I take a construction with multiple IC
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