Comparative study and design of new low voltage high performance current mirrors

Current mirror is one of the basic building blocks of analog VLSI systems. For high performance analog circuit applications, the accuracy and bandwidth are the most important parameters to determine the performance of the current mirror. This paper presents an efficient implementation of a CMOS current mirror suitable for low voltage applications. This scheme combines a shunt input feedback, a regulated cascade output and a differential amplifier to achieve low input resistance, high accuracy and high output resistance. A comparison of several architectures of this scheme based on different architecture of the amplifier is presented. The comparison includes: Input impedance, output impedance, accuracy, frequency response and settling time response. These schemes are validated with simulation in 0.18 mum CMOS TSMC of MOSIS.