Hi Parag,
By the way, the decompensated OPA37 requires a closed-loop gain ≥ 5. If I copied your circuit correctly, you are attempting to operate it in an inverting gain of -1 V/V (noise gain of +2 V/V). Therefore, the OPA37 may be unstable and oscillating…
Hello Rhandhir,
Unfortunately, the original 2012 e2e post wasn't specific regarding the location of that file. The e2e PDF access may have worked differently then, compared to today and that may be the reason it is no longer accessible. I receive the…
Hi Parag,
The dc bias arrangement of the OPA2111op amps isn't correct. The non-inverting input of U1 is at 0 V and the OPA2111 is being operated with a single +15 V supply. Its common-mode input voltage lower limit is about +4 to +5 V above the V- supply…
Hi Mark,
The OPA37 4 simulation model has only 77.9 uV of voltage offset modeled. That is optimistic for a real device, but can happen because it is within the normal distribution.
When I model your circuit in TINA, I find that it takes adding about -1.25…
Hello Baptiste,
Thanks for the additional information. 50-100kHz still seems significantly high to me.
Nonetheless, the OPA227/8 and OPA37 have high BW, low offset voltage, and come in DIP packages. Please note that there are "DIP adapter boards" that…
Other Parts Discussed in Thread: OPA37 , OPA27 , OPA350 , OPA320 , OPA365 I want to measure light intensity with a photodiode and use OPA37 to convert the photocurrent to output voltage.
The parasitic capacitance of the photodiode is around 10-15 pF, so I…
Samer,
The OPA37 is not unity-gain stable and thus cannot be used as an integrator. C8 provides a low impedance at high frequency and effectively puts the op amp in unity gain which can cause the op amp to oscillate.
OPA132 or OPA140 are possible replacements…
hello Colin
Please find attached updated signal processing chain. GBW of OPAMP is affecting filter response. So Instead of OPA320(GBW - 20 MHz) i have used OPA37(GBW-63 MHz). Instead of TLV2352 Comparator i will be using TLV3501, but it wasn't there…
Hello Lars-Olof,
When I review the OP37 data sheet I see that the trimmed offset value is less than +/-100 uV for most grades. These are very low levels so I think that you may be compensating for any offset that the Vref and DAC that precedes the op amp…