# Differential to single ended circuit

I have a differential signal up to 1.5 MHz and have to transform it to a single ended signal.

I have found this amplifier which has a BW of 2.2 MHz and should therefore be okay for this task.

The manufacturer also offers a simulation program, where I've tested this where $R_f = R_g$ and $R_1 = R_2$.

The input signals are 500mV pp and have a common voltage of 1V. Is this the right way of transforming a differential signal to a single-ended one?

• yes, but 2.2MHz is waaaaay too little bandwidth for a 1.5MHz signal, if you look at the distortion graph in the data sheet, they only bother to plot it to 5kHz! 2.2MHz is -3dB. – Neil_UK Nov 28 '17 at 14:13
• I understand. I guess it is normal for instrumentation amplifiers to not have a big BW at all. – epgrape Nov 28 '17 at 14:49
• Your opamp hasn't 2,2MHz bandwidth. Its gain-bandwidth product is 2,2MHz. You cannot have much gain at 1,5MHz. If you do not need gain, only conversion from differential to single ended, it can work, but it's still a gamble due missing specs at 1,5MHz. What is the spectral range of your signal? 1,5MHz frequency gives no info about it. There can exist usable other solutions. – user287001 Nov 28 '17 at 15:20
• @user287001 my signal ranges from DC to 1.5 MHz and you are right, I do not need gain. Just want to convert it. – epgrape Nov 28 '17 at 15:21
• @SpehroPefhany I just read the op-amp section in "the Art of electronics" and it explained alot. What a great book! – epgrape Nov 28 '17 at 18:40