Thanks for your help Michael.
The problem seems to be in TI TINA spice model.
I have been using the OPA683 under the Spice Macros tab of Tina SPICE (which yields the 2.21mv offset) when I swap the spice macro OPA683 with the OPA683 from the reference…
Other Parts Discussed in Thread: OPA683 , OPA684 Hi E2E,
I have a customer who's testing the OPA683 in TINA with the following setup:
+V rail = 5V
- V rail = GND
+ input = Sine wave, 200kHz, 200mVpp, 2.5VDC offset
Gain of 200
Disable is…
Hello Venugopal,
With single supplies you will need to shift the common mode of the DAC to that of the op amp, or you can use an op amp with an input common mode range that goes below the negative rail.
It may be easier to add a -5V supply.
…
Morning Mahsa,
I was able to recover a working version of my SKF design tool, running that with the 1mA OPA683 gave this solution - the flows are trying to reduce R's to reasonable levels to improve the noise - this is a +/-5V design, but maybe could…
While the inverting summer is standard, and item 6 above notes the BW for each channel will be the GBP/NG approximately for VFA implementation.
One of the interesting benefits of a low power current feedback implementation if the DC precision is not…
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…
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…
Morning Ryan,
You sure have a lot going on here, without getting too deep into it couple of observations
1. Your high gain cascaded stages are broadband when you say you have a noisy environment - are you sure you don't want to do a little bit of…
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…
