Electronics > Beginners
Problems with circuit(shift an differential signal)
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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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