The comment is related to the recently published papers given in [Singh, V. (2006). Analog Integrated Circuits and Signal Processing, 48, 251-255;Singh, V. (2007). Analog Integrated Circuits and Signal Processing, 50, 127-132.] which depict the failure of Barkhausen oscillation building up criterion. Many counterexamples have been given in order to substantiate such viewpoint. We would like to review these reported circuit examples and present the treatment of Barkhausen oscillation criterion.

SUMMARYA novel CMOS cascode current mirror configuration with enhanced input dynamic range is presented. The proposed mirror circuit combines the advantages of wide input swing, wide output swing and large output resistance capability, which make it attractive for practical application. Based on 0.18 m MOS model parameters, HSPICE simulation results show that the input current ranges from 1 A to 1 mA with large bandwidth for the proposed circuit. The simulation results confirm the theoretical prediction.