Hi there,
I have been trying to analyse the difference between these two circuits. I have been able to work out, mathematically, the merits of the right-hand schematic but I am finding it difficult to work out the left-hand schematic. I run both schematics on TINA, using a 1V p-p sinusoidal waveform to the inputs and measuring the outputs. In both cases, I had similar results but there was a slight difference in the gain vs frequency plot but I can't explain.
I need some help with the above.
Regards,
Jeffrey. 