I was having a discussion with someone about using a virtual gnd for an opamp circuit. One way to provide the VCC/2 voltage is with a voltage divider made of two precision resistors (and a capacitor for stability). Another suggestion was to use a resistor and a zener to set it.
Which method is better, or if that's not a valid question what are the merits of each method. I would think with resistors of tight tolerance I could approach the accuracy of the zener method. Also I'd think the zener method would mean if my VCC dipped, or I was on a battery that the voltage would not stay at VCC/2 but rather the zener voltage.
I couldn't think of any pros for the zener column.
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