High-Swing CMOS Cascode Current Mirror Operating with 1V Power Supply Voltage

Sibum JUN  Dae Mann KIM  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E80-A   No.6   pp.1083-1091
Publication Date: 1997/06/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Analog Signal Processing
current mirror,  adaptive-biasing,  high-swing,  low voltage,  

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A high performance, high-swing CMOS cascode current mirror operating with 1V power supply voltage and using standard CMOS technology is presented. The present circuit employs PMOS source-coupled pair as voltage level shifter to reduce the power supply voltage requirement. The additional advantages of the use of the source-coupled pair are the improved output resistance and the automatic adaptive biasing, thereby enabling the high-swing of output terminal, when used in the cascode configuration. An analytical discussion of the circuit is carried out and the results are confirmed by SPICE simulation. SPICE simulation results show that the input voltage requirement is 370mV and the minimum output voltage requirement is 273mV at the maximum input current of 40µA, whose requirements decrease with decreasing input currens. The output resistance is shown to be greater than 4MΩ at the maximum output current of 40µA, which increases with decreasing output currents. The -3dB bandwidth is shown to be greater than 400MHz and the total harmonic distortion better than -54.34dB at 100kHz at the maximum peak-to-peak input current swing of 40µA. The present circuit will be useful for the low voltage, low power, high-performance mixed analog/digital signal processing.