Hi Jason,
and here's the phase response analysis:
You can see that the phase margin is 85°, which is perfect.
C3 simulates the detector capacitance and the cable capacitance. And CL simulates any capacitive load, which could sit at the output…
Kai,
Thanks for providing a practical implementation of a switchable TIA and absolute value amplifier circuit. I agree with your selection of the LMC6081 for the TIA and the OPA196 (or OPA2196 dual) for the absolute value amplifier circuit.
You are…
Hi John,
LMC6001 and LMP7721 are the two lowest Ib options we have. A lower cost option might be LMC6081, with a 100fA input bias current. While LMC6001 and LMC6081 both share a common pinout, LMP7721 has a different pinout (and is only available in…
Hello Peng,
The LMC6001 is based off the LMC6081, with layout improvements to improve bias current yield.
The LMC6041 is the micropower version of the LMC6081, so the noise will be higher since micro-power parts are noisier than their "normal" power…
Ron：
I think I need tell U my solution.
When I check my LMC6001, I find mark on this chip is NS not TI. So maybe this is an old product or fake one. Cause I haven't a new one at hand. So I use LM358 to test this circuit. And It worked well.
And…
Hi Isaiah,
LMP2012 is CMOS. A couple of ways you can identify this are:
Input Bias Current - for a bipolar device, bias current is typically on the order of tens to hundreds of nanoamps at room temperature. FET or CMOS op amps will typically have…
Hi Eric,
If 5V is too low and can go up to 15V supply, I would also recommend the LMC6001 (tested to 25fA) or LMC6081 (parent die of LMC6001 and still typically <20fA). Or the LMC6482 if you need R-R input (also typically <20fA).
Hi Mike,
The LMC series has lower sourcing gain. It's the nature of the process and devices used. This can be seen in the Large Signal Voltage Gain section of the LMC66x electrical table.
A good visual example is in Figure 8 of the LMC6081 datasheet…
Hello,
There is not a direct replacement for the OPA317 in a PDIP package. Some other devices that would work in this application and are available in the PDIP package include the OPA340, OPA344, and LMC6081.
