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A low-voltage MOS cascode current mirror for all current levels

In this paper, we describe a simple low-voltage MOS cascode current mirror that functions well at all current levels, ranging from weak inversion to strong inversion. The circuit features a wide output voltage swing and requires an input voltage of approximately one diode drop plus a saturation voltage. We present experimental results from a version of the current mirror that was fabricated in a 0.5 /spl mu/m CMOS process along with a comparison with several other current mirrors with respect both to required input voltage and to output compliance voltage.