Abstract
This paper presents a temperature-compensated CMOS current reference with low line regulation current mirror. The circuit is based on a bandgap reference voltage that achieves the temperature compensation of resistor by the negative temperature coefficient (TC) of a high-resistance polysilicon (HR poly) resistor with the positive TC of an n-well resistor. The low line regulation current mirror is implemented by using a negative feedback connected operational amplifier. Prototypes of 1 μA current reference from 0.35 μm CMOS process show a maximum temperature coefficient of 139 ppm/°C for a temperature range of 0---80 °C. The line regulation is reduced to 0.5 %/V for supply voltage of 3.5 to 5.5 V.
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