Low power high output impedance high bandwidth QFGMOS current mirror
Current mirror is a basic block of any mixed-signal circuit for example in an analog-to-digital converter. Its precise performance is the key requirement for analog circuits where offset is a measure issue. The key parameter which defines the performance of current mirror is its input/output impedance, input swing, and bandwidth. In this paper, a low power design of current mirror using quasi-floating gate MOS transistor is presented. The proposed current mirror boosts its output impedance in range of giga-ohm through use of regulated cascode structure followed by super-cascode. Another improvement is done in reduced input compliance voltage limits with the help of level shifter. The proposed current mirror operates well for input current range 0700?A ? A with an input and output impedance of 160? ? and 8.55G? G ? respectively and high bandwidth of 4.05GHz GHz . The total power consumption of the proposed current mirror is about 0.84mW. The low power consumption with enhanced output impedance and bandwidth suits proposed current mirror for various high-speed analog designs. Performance of the presented current mirror circuit is verified using HSpice simulations on 0.18?m ? m mixed-mode twill-well technology at a supply voltage of 0.5V.
low power bandwidth qfgmos input/output impedance compliance voltage