High-Order Current-Mode Universal Filter Using CCIIs and Grounded Passive Components

This paper presents a new high-order universal filter structure with multiple-inputs and single-output. The structure only employs n second-generation current conveyors (CCIIs), n grounded capacitors, and n grounded resistors, which can realize nth-order universal filtering responses (lowpass, highpass, bandpass, band-reject, and allpass) from the same topology. Moreover, the proposed high-order filter still achieves many advantages like the employment of all grounded passive components, and the minimum number of active and passive components, in addition to having no need of inverting-type input signals or double-type input signals for the use of special input signals, no need of component matching conditions, high output impedance and low sensitivity performance. H-Spice simulation results confirm the theory. Keywords—Active filters, second-generation current conveyors, current-mode, high-order filter, universal filter.