I need to bias some op amp inputs with a voltage. I’m in the 10-60 hz range. I need the bias voltage to be as low noise as possible, like -155 dbv . Would a voltage reference, voltage regulator, or even zener diode work the best here? I’m confused as to which part would work the best. And do I need to drive the bias through a voltage buffer or can I put it right onto the inputs?
Your goal of -155dBv, given -160dBv is 10^-8 below 1volt (peak-peak?) is 10 nanoVolts.
We know, using Vnoise = sqrt(K * T /C)
that 10 picoFarads as the Cap, in a low-pass-filter with any value of R, will produce 20 microVolts RMS total integrated noise.
You want to be 2,000X lower noise than 10pF will produce.
Thus your capacitor must be 10pF * ( 2,000 * 2,000) = 40 uFarad. Try a 47uF.
Pick your R as you wish. Just use at least 40uF in the LPF.
The OP wants at least -155, which is close to -154, which is 6dB more voltage than the 40uF produces. 6dB, or 2x more voltage, allows 4x small cap, at 10uF.