A novel stray-insensitive realisation for switched-capacitor filters is presented. A factored state-space representation provides a means of implementing orthogonal filter structures with good sensitivity properties. The factored state-space realisation is represented by a regular signal flow graph. Switched-capacitor realisations of the basic sections of the signal flow graph are proposed. A four-phase implementation provides a stray-insensitive switched-capacitor realisation. A design example illustrates the application of this novel approach.