A low voltage high output impedance bulk driven regulated cascode current mirror

This work proposes the design of a new low voltage high output impedance CMOS current mirror that offers enhanced output voltage compliance using bulk-driven technique. The input/output characteristics of the proposed current mirror are discussed. Designed circuit is simulated in a proprietary 180 nm CMOS process, using Cadence Spectre and BSIM3v3 models. Simulated results with 0.8 V power supply and 50 uA input current reveal that the proposed implementation requires a minimum input and output voltages of 0.4 V and 0.39 V respectively. It yields an increase of the output impedance compared with that of existing bulk driven current mirrors, thus offering a potential solution to mitigate the effect of ultra-deep submicron CMOS transistors used in sub 1-V current mirrors and current sources. Compared to high output impedance gate driven regulated cascode current mirror (GDRCCM), low voltage high output impedance body driven regulated cascode current mirror (BDRCCM) supports higher output voltage swing. Thus, the proposed design finds wide acceptability in low voltage and low power CMOS analog integrated circuits.

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