I am attaching the screenshot of differential op-amp with positive feedback(TLV9062),i am having the doubt ,is the output is same as input with all the same resistor values or any effect with positive feedback,can anyone explain? here i need differential to single ended output.
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\$\begingroup\$ The circuit diagram is not complete....no negative fedback? There is an open path at the output.... \$\endgroup\$– LvWCommented Sep 3, 2020 at 6:58
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\$\begingroup\$ Generally if you have an opamp circuit with positive feedback, the output will just slam to one of the rails like a comparator, or it will oscillate. Which Is your intent? \$\endgroup\$– Kyle BCommented Sep 3, 2020 at 7:26
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\$\begingroup\$ actually i need differential to single ended output voltage at TLV9062 op-amp \$\endgroup\$– maneeshaCommented Sep 3, 2020 at 7:30
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\$\begingroup\$ I need output of amc1311 as same as Vin and this differential output changed to single ended using an op-amp,so can you please explain any changes in this circuit for working as differential to single ended. \$\endgroup\$– maneeshaCommented Sep 3, 2020 at 7:33
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2 Answers
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The (+) and (-) inputs should be swapped on the TLV9062 for it to function as a difference amplifier or differential to single-ended converter.
Also the resistor values are way too low. They should be more like 20K than 20 ohms.
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\$\begingroup\$ I am attching the screenshots of my simulation can you explain the problem present in that simulation? \$\endgroup\$– maneeshaCommented Sep 3, 2020 at 9:57
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\$\begingroup\$ I am replacing the tlv9062 with tlv2221 and changed the (+) and (-) terminals in opamp that time also i am getting the false output,what is the problem here, can you explain. \$\endgroup\$– maneeshaCommented Sep 3, 2020 at 10:03
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\$\begingroup\$ Please plot VOUTN as well and swap VOUTP and VOUTN. \$\endgroup\$ Commented Sep 3, 2020 at 10:10
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\$\begingroup\$ After swaping the VOUTN and VOUTP also i am getting the opamp output as constant 3.3v at opamp and as well as at comparator.i am attaching the screenshots also. \$\endgroup\$– maneeshaCommented Sep 3, 2020 at 10:14
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\$\begingroup\$ The output at the TLV2221 should now be (VOUTP - VOUTN) but limited to 0/3.3V approximately. We need to see VOUTP and VOUTN on the same graph. \$\endgroup\$ Commented Sep 3, 2020 at 10:19
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Differential to single ended output op-amp:
The generator and the two 1k resistors model the previous stage.
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\$\begingroup\$ thank you, but i use amc1311 isolation op-amp,is it working with TLV9062 op-amp ?what modification are done in my circuit,can you please explain? \$\endgroup\$– maneeshaCommented Sep 3, 2020 at 8:00
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\$\begingroup\$ The isolation op-amp can remain as it was before. \$\endgroup\$– csabahuCommented Sep 3, 2020 at 8:13