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Loop gain

JohnRuhl opened this issue · comments

commented

bolo-calc currently assumes we are in the high loop-gain limit, setting the responsivity to 1/V_bias, when it deals with readout noise (and in the future when it deals with Johnson noise), converting NEI to NEP.

It would be nice to have the option of setting alpha = (T/R)(dR/dT) = d(lnR)/d(lnT) as an input, and using that alpha to calculate the loop gan L = (alphaP_electrical)/(GTc), and then both report that loop gain and use it to calculate and use the responsivity in calculating noise contributions.

Note that Johnson noise is suppressed by the loop gain, so this issue and the Johnson noise issue are related. A default value of loop gain (suggestion: L=30) will be required for calculating Johnson noise, if alpha is not specified.