A Novel Cmos Cccii With Wide Tunable R-X And Its Application

This paper introduces a novel CMOS second-generation current-controlled current conveyor (CCCII) that has a wide tunable intrinsic resistance (R-x). The designed structure is achieved by the combination of one ordinary CCCII, one cross-coupled OTA and one active resistor. An inverse relationship between the intrinsic resistance and external bias current is created for the first time in CMOS CCCII design, which results in wide tuning range of R-x. Performance of the proposed circuit is discussed by detailed analysis. The CMOS CCCII is simulated in TSMC 0.18 mu m RF CMOS technology. The simulation results confirm that the proposed CMOS CCCII achieves a wide tunable R-x (from 197.4 Omega to 27.23 k Omega) while maintaining favorable performance in bandwidth, transfer gain and linear range. In addition, a new reconfigurable structure, which can function as a universal filter or a quadrature oscillator via controlling an enabled switch, is given as an application example to validate the feasibility of the proposed CMOS CCCII.