Hi i am using ina 114 for my signal conditioning circuit.According to the calculation the G=1+(50k/Rg). When i set the Rg value to 50k the gain must be 2 an if i give 10 mv of input to the non inverting terminal the output must be 20mv but the output is 647mv till the input is 550 mv. Can any body help me out.

 

Post your schematic.

 

The INA114 requires a dual-rail supply; it will not work properly with a single supply.

If you must operate an instrumentation amplifier with a single supply, you need to select a different model.

 

Thanks for ur information. I have now optimized my circuit for ina 114 using single supply. I have made an virtual ground with vcc/2 (using the voltage divider circuit) to the inverting terminal (PIN 2)and i have connected the Vref (PIN 5) of ina114 to the virtual ground. And by giving the input to non inverting terminal (PIN 3) with respect to the virtual ground and by measuring the output from the Vout (PIN 6) with respect to the virtual ground i am obtaining the gain exactly what required(only the range of the output voltage is reduced to 0v-1.5v when vcc is 5v, and 0v-3v when vc is 12 v). I want to provide the input and measure the output with respect to the system ground. Is this possible can u please help me out...


Thank you..

 

Post your schematic. This is my new circuit for single supply

 

Post your schematic. This is my new circuit for single supply

 

Sure. Add a negative supply rail, and get rid of your virtual ground.

Either that, or get an instrumentation amplifier that is rated for single-supply operation who's input and output range includes ground.

 

Thanks...Since my circuit is battery powered i cannot go for the negative supply , i have to work with the single supply....

 

So use two batteries in series, with the junction in between them grounded.

Or, use a DC-DC converter like an ICL7660 to generate a negative rail from the positive rail.

 

So use two batteries in series, with the junction in between them grounded.

Or, use a DC-DC converter like an ICL7660 to generate a negative rail from the positive rail.

Thanks ..i got the output...

 

i m using INA114 in my project but i cant find it in proteus software . any one please help me how can i add this or other options to use this in simulation .
Thanks

 

how did u made INA 114 in prepteous ??? can u please tell that to me