1. A method of creating a cell library comprising: using a computer to perform the following: providing a first cell identifier, the first cell identifier corresponding to a first cell, the first cell being a functional element; providing a first set of model definition data for a receiver model, the first set of model definition data being associated with the first cell identifier, the first set of model definition data comprising: a first value for a first capacitance, the receiver model being configured to use the first capacitance to generate a first portion of a model receiver signal; and a first value for a second capacitance, the receiver model being configured to use the second capacitance to generate a second portion of the model receiver signal; generating a first cell entry including the first cell identifier and the first set of model definition data; and organizing cell entries, including the first cell entry, to create the cell library.