A new synthesis technique for the exact design of switched-capacitor LDI allpass networks

A method for the exact design and synthesis of general nth-order switched-capacitor (SC) lossless discrete-integrator (LDI) allpass networks is presented. In this method, the entire LDI SC allpass network synthesis is performed directly in the discrete-time z-domain, i.e. without any recourse to the concept of a corresponding continuous-time analog prototype reference network or its transfer function. This results in the development of two LDI SC allpass structures, one of which is completely new (using a leapfrog configuration), while the other has recently been obtained elsewhere by using the (indirect) bilinear-LDI design method. These SC allpass network structures require n+1 operational amplifiers (OAs) for their implementation, which is only one OA more than the minimum number possible