Current-mode triangular wave generator using CCIIs

A current-mode triangular wave generator circuit using two positive second-generation current conveyors (CCII+) is proposed and implemented. The circuit consists of an astable multivibrator to generate a square wave followed by an integrator. The analytical formulas for the frequency and the amplitude are derived, the circuit is simulated using PSPICE, and AD844 IC is used for the circuit implementation. Comparison between the measured and calculated frequencies shows a good agreement. Compared to either a recently reported current-mode generators or conventional voltage-mode generators, the circuit works over a wider range of frequencies with a maximum frequency of 410 kHz which is achieved by tuning a grounded capacitor. In addition, the circuit features an independent control of its oscillation frequency from the signal amplitude using grounded elements. (C) 2000 Elsevier Science Ltd. All rights reserved.