Abstract In this paper a novel high output impedance, low input impedance, wide bandwidth, very simple current mirror with input and output voltage requirements less than that of a simple current mirror is presented. These features are achieved with very simple structure avoiding extra large node impedances to ensure high bandwidth operation. scussed and compared to simple and low voltage cascode (LVC) current mirrors. Such outstanding features of this current mirror as high output impedance ~384K, low input impedance~6.4, wide bandwidth~178MHz, low input voltage ~ 362mV, low output voltage ~ 38mV and low current transfer error ~4% (all at 50μA) makes it an outstanding choice for high performance applications. Simulation results in BSIM 0.35μm CMOS technology with HSPICE are given in comparison with simple, and LVC current mirrors to verify and validate the performance of the proposed current mirror. Keywords Analog circuits, Current mirror, high frequency, Low power, Low voltage. I. INTRODUCTION urrent mirror is one of the most essential building blocks in analog integrated circuits which its performance affects qualitive performance of the system. The major draw backs of conventional current mirrors due to technology scaling trend in VLSI design tend to be: voltage supply reduction requirement, input and output impedances degradation, and high frequency malfunctioning. Considering that in many applications, the performance of the traditional current mirrors are inadequate; In the past two decade, a series of high performance current mirrors has been reported [1]-[13]. Low power current mirrors using low supply voltages are attractive for all designers. Meanwhile, traditional current mirrors/sources, such as simple, cascode, and regulated current mirrors/sources [1], suffer from a trade-off between the output resistance and the compliance voltage (the minimum voltage required for the current mirror/source to operate). Some topologies such as the high swing cascode [2] and the active regulated cascode [3] have improved R out with a relatively low compliance voltage of 2V DSsat . This, however, may still be too large to be tolerated in K. Monfaredi is with Sama Organization (Affiliated with Islamic Azad University)-Miyandoab Branch (khmonfaredi@iust.ac.ir). H. Faraji Baghtash is with Iran university of science and technology (IUST) electrical and electronic engineering faculty/ Electronics research center (corresponding author to provide Email: 86611114@ee.iust.ac.ir). M. Abbasi is with the Electrical Engineering Department, Iran University of science and technology (IUST) (mabbasi@ee.iust.ac.ir). low voltage circuits. In [4]-[5] are presented current sources with high output resistance and compliance voltage of one V DSsat . The circuit in [4] works based on sensing the voltage across the current source. Its draw backs are high frequency degradation and instability problems. The circuit in [5] uses positive feedback to increase its output impedance reduce its output compliance voltage. These circuits however are used as current sources and are not suitable as current mirrors. Although the circuits proposed in [6]-[8] eliminate some of the above mentioned draw backs, however they suffer from heavy structures and large chip area consumption. In order to further relaxing voltage requirements some techniques such as body driven topologies are introduced in literatures [9]-[11]. These circuits suffer from lower bandwidth, expensive technology and higher input impedance due to g mb being lower than g m . Another method for increase the linearity and decrease input voltage swing of current mirrors is to use self biasing structures, which offer reduction in voltage and power supply because of adaptive biasing [13], but they suffer from complexity, larger area. Self biasing improves the performance of current mirrors when the supply voltage is decreased. In this work a high performance current mirror is presented in which favorably most of aforementioned characteristics are improved. In section II the proposed current mirror is explained. Section III includes the results achieved from simulations. And finally Section IV concludes this paper. II. PROPOSED HIGH PERFORMANCE CURRENT MIRROR A. Principle of Operation The proposed current mirror, which its schematic is shown in Fig. 1, is composed of M1 and M2 as mirror transistors, M3 and Mp1 as feedback transistors, M4 as shift transistor, and bias current of Ib. aspect ratio of M4 and I b are adjusted to set V ds1 equal to V ds2 prohibiting the channel effect and attaining a high precision result. By using FVF structure [12] at input node low input voltage is achieved and at the same time containing a positive feedback loop of M1, M2, M3, M4, and Mp1 in the other side causes the input impedance to be extremely low and output impedance to be extremely high. In other words, transistors M2, M4, M3, and Mp1 create output positive feedback. Transistors M2, M4, M3, and M1 create input positive feedback. The above mentioned positive A Novel Low Power Very Low Voltage High Performance Current Mirror Khalil Monfaredi, Hassan Faraji Baghtash, Majid Abbasi C World Academy of Science, Engineering and Technology International Journal of Electronics and Communication Engineering Vol:4, No:10, 2010 1454 International Scholarly and Scientific Research & Innovation 4(10) 2010 scholar.waset.org/1307-6892/12128 International Science Index, Electronics and Communication Engineering Vol:4, No:10, 2010 waset.org/Publication/12128