Part Number: JFE2140 Other Parts Discussed in Thread: TINA-TI 原理图如下，和JFE2140EVM不同之处，R204,R205 3K 1%， R210 8.2K 1%，R208 1K 1%, 目前实际贴的电阻都为1%，
不接输入/接GND的情况下，会输出如下波形： 但通过Tina-TI仿真是正常的，暂时找不到哪里问题，请帮指导调试方向
Part Number: JFE2140 Other Parts Discussed in Thread: , OPA202 , OPA145 Hi,
Is the offset correction integrator circuit (U3 & surrounding) in the JFE2140EVM actually tested working?
https://www.ti.com/lit/ug/slpu010/slpu010.pdf
I've run a simulation…
Hey Itmar,
It is hard to say why they would not have aligned however that is surprising. It is possible the antenna model is not accurate. My other suspicions would be the biasing of the JFETs, common mode input voltage was exceeded or output signal was…
Hey Andrew,
The OPA1642 has much lower current noise and better 1/f noise than the OPA1656. For high source impedance sensors such as a phono cartridge lower current noise is better. The current noise paired with high source impedance translates into additional…
Hello Michael,
Considering the low frequency requirement I might suggest looking first at the circuit for the JFE2140EVM. You can see below the transfer function has a gain of 1000V/V or 60dB down to very low frequencies (Even much further down that what…
