A high-accuracy low-power current mirror with extended dynamic range

An amplifier-based current mirror circuit for a wide dynamic range has been presented in this paper. In the proposed work, the current mirror uses a modified Flipped Voltage Follower with a level shifter approach, incorporating a CMOS Current Differential Amplifier (CDA) as an active amplifier to enhance amplification, dynamic current range, and output swing. This current mirror design demonstrates a wide current mirroring range of up to 3 mA with minimal current transfer error (0.42%) and low input resistance of 2.69 Ω with a bandwidth of 1.038 GHz. An improved output resistance is achieved by applying a modified feedback approach at the output stage, resulting in an increase from MΩ to GΩ. The current mirror delivers a high output swing of 0.7–0.8 V, with power dissipation within the microwatt range. As an application, a first-order current mode low pass filter is realized using a proposed architecture. The performance analysis of the proposed work is supported through small signal analysis. The simulations and corner analysis are also carried using Cadence Virtuoso on UMC 180 nm technology.