Hi all! ;)
I want to convert a sinusoidal signal (-5...5 V) with a frequency of 100...500 kHz into a quadrature pulse signal in the range of 0...5 V and the same frequency. For this purpose I want to use the comparator circuit in the attached picture:
To shift the input voltage into the supply range of the comparator, I use a resistive divider (R3 and R2) to attenuate the incoming sine and I use a voltage source to bias and center the signal around 2.5 V DC. I thought about using a voltage reference for that purpose because the 2.5 V source would not have to provide a big power for a load. It just has to sink and source a small current.
My question is: Would this be a suitable application for a voltage reference? Which reference (or which class of voltage references) would you recommend for this purpose? I would like the reference to have a very small serial resistance (in this case to GND) because otherwise it would influence the center potential of the voltage divider (V_in+).
What do you think?
Thanks in advance and best regards!