| Electronics > Beginners |
| Problems with circuit(shift an differential signal) |
| (1/1) |
| baksuz:
Hiii guys, I am trying to shift an differential signal, up to get for example from -2.5 , 2.5 to 0,5 . I have found on Level Shifting Signals With Differential Amplifiers Texas Instruments http://www.ti.com/lit/an/sboa038a/sboa038a.pdf (schematics of circuit is in attachment) The problem is I have bought all part, but I cant make it work , and the problem is that I have just one power supply( I think that is a problem), I will attacht schematics of my circuit and hope so someone will help me. Have nice day :D |
| David Hess:
First you will have to define the problem because that circuit will not shift a differential signal. Do you actually mean differential signal? If so, do you mean shift the differential or common mode value? Leveling shifting a single ended signal just requires a summing amplifier although often this is done with an instrumentation amplifier as shown in your example. |
| akowalczyk:
Hi! Can you clarify what U3 is? That will help determine what type of signal output it will have. Looks like some sort of encoder or resolver If it's a resolver, I think your summing circuit is correct, but you might need both terminals of the device hooked up Hope this helps! |
| pwlps:
--- Quote from: baksuz on May 14, 2019, 11:33:11 am ---The problem is I have bought all part, but I cant make it work , and the problem is that I have just one power supply( I think that is a problem), I will attacht schematics of my circuit and hope so someone will help me. --- End quote --- Yes, quoting from the datasheet: POWER SUPPLY Voltage Range : Min ±5 Max ±15 But in the document you cite they suggest : --- Quote ---For precision level shifting in low voltage applications, the INA213 is an alternative to the INA105. The INA213 operates from a single 2.7-V to 26-V power supply that makes it suitable for lower voltage systems with single supplies. --- End quote --- |
| Zero999:
I take it you want to convert a differential -2.5V to +2.5V signal to single ended 0 to +5V? All you need to do is bias the reference pin of the INA105 at 2.5V, which could be done with an op-amp and potential divider, assuming you have an accurate enough 5V power supply available. Note that the INA105, needs a bipolar power supply: at least +10V and -5V is recommended. It won't work off a single 5V power supply. |
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