Simple CMOS Square Wave Generator with Variable Mode Output

A novel square-wave generator based on a single CCCII (current controlled conveyor), with only two external grounded passive components is proposed in this paper. The circuit provides precise, electronic controllable, voltage or current output square-wave signals. The simulation results using 0.18mm CMOS parameters and experimental verification confirm the feasibility of the proposed circuit. The proposed generator can operate very well up to 25MHz with nonlinearity less than 5%.