Current Mirror Layout Strategies for Enhancing Matching Performance

This paper proposes new current mirror layout strategies to reduce the matching sensitivity to the linear parameter gradients. Effects of threshold gradients across a mirror on the matching characteristics of current mirrors are discussed. The performance of new and existing layouts are compared for threshold voltage gradients at arbitrary angles through the active area. Simulation results show a significant improvement in matching characteristics of the proposed structures over what is achievable with existing layout techniques in demanding applications.