HI Sir
I want to confirm whether the original factory has the recommended gain and magnification for OPA189.
In addition to the decrease in bandwidth, are there other shortcomings in the revenue value of competition?
Hi Alex,
Q: In addition to the decrease in bandwidth, are there other shortcomings in the revenue value of competition?
You may use any of gain values that specified in Figure 7-9 and others. The decreasing in BW is due to Gain Bandwidth Product. If the op amp is driving resistive load with Gain >=1, you should not have any issues. We can compensate the feedback loop, if you are driving complex load.
With Gain= -1 or lower, you need to check with phase margin in the close loop. It is fairly easy compensate the Q, and improve the phase margin, see the attached simulation.
Is there a particular op amp configuration you are interested?
/cfs-file/__key/communityserver-discussions-components-files/14/OPA189-_2D00_1-Gain-11112020.TSC
If you need additional assistant, please let us know.
Best,
Raymond
