Well Shota,
The CMRR for a CFA arises from the buffer gain across the inputs being slightly <1. THe Buffer gain in the THS3491 is very close to 1.0000 due to the very high output impedance current sources driving the buffer transistors. The previous…
Part Number: THS3491 Other Parts Discussed in Thread: , OPA684 Dear Team,
I build THS3491 demo with this board.
Rf=300Ω
Rg=40.2Ω
This specs come from customer, and I know it's unreasonable for Rf is too small at this Gain. When increasing…
Hi Ronald,
thank you for your advice and sorry to bother you so much.
I have tried many times and finally i added a -5V as source for OPA684 and left 8th pin of OPA684 open. I think it works now but not so well as follows. The two inputs are 5mV and…
Just to illustrate some ideas, see this OPA838 + OPA684 single 5V AC coupled design. I think the inupt referred noise is pretty high here and I do have some old circuits I did that can improve that, but that is much larger discussion - if this is good…
Part Number: THS3001 Other Parts Discussed in Thread: OPA695 , LMH6702 , THS3217 , THS3215 , OPA684 , THS3092 , OPA4872 Dear all,
I guess it is a simple question but due to my lack of experience in analog electronics I would like to be sure of what…
Thanks Chris, back now, did a little 4 wheeling this AM to pass the time in a safely social distancing fashion.
well, as the IC designer on one of the 1st CFA (CLC400) I felt like I needed (at that time, to get a little street cred with all the HP instrument…
All I know is that the input is applied to the positive terminal through an AC coupling capacitor and supply voltage is 5V.
The customer swapped the OPA684 for the OPA683 and it works! Would swapping the op amps truly fix the output or is it an issue…
Other Parts Discussed in Thread: OPA684 , OPA2684 , LMV7239 , LMV7291 , TINA-TI , LMV7271 Hi E2E,
My customer is simulating the OPA2684 and the OPA684 in TINA. The sim works fine until he imports the LMV7239 comparator. Once imported, TINA fails to…
Update from the customer:
Restarting does not help but I think it has something to do with the parts I use. Right now I just ran the simulation three times and it runs with valid outputs. However if I change the op-amp in the post amplifier circuit…
Other Parts Discussed in Thread: OPA890 , OPA836 , OPA684 , OPA690 , OPA683 , OPA830 Hello ,
I 'm driving a 16bits SAR ADC (from ADI) using the OPA890. The driver consists of 2 single OPA890 to generate at the ADC inputs two signals in opposite phase…
