Low-voltage wide-range high-impedance flipped voltage follower current mirror

In this paper, a wide-range current mirror based on a low-power flipped voltage follower with improved performance parameters is proposed. In the proposed design the flipped voltage follower cell uses a MOS transistor in its feedback path, due to which the output impedance gets scaled down, which when applied for current mirror realization shows very low input resistance of about 48 ohms. The other improvement achieved is in terms of output resistance, for which the cascode approach has been utilized. The output resistance achieved is 3G ohms. The proposed current mirror operates with minimal error till 1 mA and exhibits very less input compliance voltage. The -3 dB bandwidth is about 890 MHz. The process corner, temperature analysis and Monte Carlo runs for the proposed design are also shown. The complete analysis is done using Spice on 0.18-um technology at a supply voltage of +/- 0.5 V.