A new feasible method for the design of stray-insensitive optimum switched capacitor networks (original) (raw)

On the basis of signal flow graphs a general method is described for the design of stray-insensitive switched capacitor networks. To be able to choose the optimum one, the method involves the search of all possible topologies for the specially formed signal flow graph of the given z-domain transfer function and is easily implemented by digital computer. 2. FORMULATION Let the z-domain transfer function of the SC network to be designed be Consider the SFG shown in Figure I , which is a generalization of the graph given in Reference 3. Let the branches have transmittances in the forms Ki = ai + biz-', Gi = C; + diz-' where i = 1,2, ..., n; a;, b;, c; and d; are real numbers. The overall gain of this SFG can be calculated to be