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| differential Op-amp with 1V offset design difficulties |
| << < (3/4) > >> |
| David Hess:
I have used the standard 4 resistor difference amplifier before for that application with good results. When you ground the input, the offset voltage of the operational amplifier is applied to the output. |
| SeaMaster:
I think I got it working finally. We are getting about 30-40mV accuracy, and could do probably better if we use more than offset and ratio calibration. with 10 or more calibration points we should het about 20mV which is plenty accurate for automotive battery measurement here is the link too the controller we are using: https://www.esp32.com/viewtopic.php?t=2881 |
| EEEnthusiast:
That ADC curve looks really gross. The INL on that may be few 100 LSBs I think. |
| Warhawk:
Guys, I am just walking by but let me make a comment. I believe it is the right place. Differential amplifier - by this the industry typically understands a fully differential amplifier Difference amplifier - a standard opamp with 4 resistors |
| David Hess:
--- Quote from: Warhawk on November 16, 2019, 06:15:53 pm ---Guys, I am just walking by but let me make a comment. I believe it is the right place. Differential amplifier - by this the industry typically understands a fully differential amplifier Difference amplifier - a standard opamp with 4 resistors --- End quote --- Texas Instruments did not help by releasing application notes which confused all three terms. Differential amplifiers have differential inputs and outputs. How to distinguish difference from instrumentation amplifiers is more difficult but they both do the same thing while the later has high impedance inputs. There are multiple ways to implement any of them. |
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