Hi Charles,
I know what is going on. You are applying the OPA4188 amplifier section as a comparator, with a 2.21 V reference voltage applied to the inverting input. When you drive the non-inverting input to the 1.45 V level you forward bias one of the…
David,
We have several quad op amps with the input common-mode voltage range beyond both rails; please see take a look at OPA4191, OPA4192, OPA4196 and OPA4197.
Alex, I've just tested the circuit replacing OPA4188 for the OPA4170. It performed as expected, without any distortion. I tested it with input frequencies as high as 40 kHz (4 times higher than the actual input maximum) and didn't get any distortion…
Part Number: OPA4188 Other Parts Discussed in Thread: INA149 , OPA4191 , OPA4192 , TINA-TI Dears,
I want to sampling the BUS voltage, the total voltage is about 800V(DC). I have adjusted to about 50V through precision resistance voltage divider, and then…