Hello Tom,
yes, thank you for the comment. As also explained in TIDUBX1B (Sec 4.5), the resistor are used to compensate for the large shunt and to add an offset to VINN. For those of you, who would like more information about it, this is explained in…
Thanks Uttam. Let's assume that a shunt reference is placed very close to the VRef pin of the DAC. That eliminates a voltage drop as a source of error. Why does the buffer offer better performance? I looked at the glitch noise in Figure 10 of the data…
Hello KF,
Please see that attached Op amps - Trust but Verify pdf. The transformation from open-loop output impedance (Zo) to closed-loop output impedance (Zol) is covered in the slides.
Note that the OPA197 Zo is quite flat over a wide frequency…
Other Parts Discussed in Thread: OPA376 , PGA308 , TLC2652 Hi all,
I am trying to build a pre-amplifier circuitry for EEG signal (1uVpk-pk@0.5~100Hz), but I am confused with the selections of amplifiers.
Will Auto-Zero amplifiers like PGA308 or Chooper…
Hi Hakan,
I'm not sure if the additional buffer prior to the MUX will be of much benefit...Each additional amplifier stage will contribute additional noise, offset and offset drift to your measurement and the offsets of the TLV2774 and OPA365 are fairly…
Martin,
OPA330 is a chopper amplifier and as such should NOT be used as a comparator because pulling the inputs apart prevents the chopper from correcting its inherent input voltage offset (input offset voltage will be in mV instead of microvolts).…
Hello Pratik,
1. Place bypass capacitors C1 and C2 on VS+ pin 10 of IC1.
2. Connect /PD pin 3 of IC1 to VS+ pin 10 53_SUP to enable amplifier.
3. Increase C4 from 1uF to 10uF to meet minimum output capacitance requirement.
4. Include RC filter…
Hi Kensuke-san,
Yes. The LMV834 can be used in a differential drive.
There is a nice differential electret microphone circuit in Figure 30 of the OPA376 datasheet. The LMV834 should also work fine in that circuit (while adding EMI protection). Everything…
Glen,
Why do you intend on using high voltage op amp like OPA140 for a low-voltage application. How about instead using OPA320 or OPA376?
Also, are you using the op amp in an open-loop configuration where +in=4.3V and -in=2.5V? If you use it in a…
Hi Kailyn,
I think that you want to find a closed loop stability of the V-to-I converter.
There are two feedback loops within the circuit. The inner loop is negative feedback and outer loop is positive voltage feedback. I think that you have to solve…
