function [ tf_RefCav ] = make_tfRefCav( exc_peak,err_peak,NPRO_PZT,Refcav_cavitypole, varargin)
%local function for FSS noise budget

opgain = err_peak/exc_peak/NPRO_PZT;

% transfer function
tf_RefCav = tf(opgain,[1/(2*pi*Refcav_cavitypole) 1]);


end