High temp stability reference voltage source corrected by 1V power supply non-linear technology

Abstract

A reference voltage source of integrated circuit is featured as applying nonlinear correction technique to counterbalance logarithmic term in temperature coefficient of output current to make outputted voltage source have very high temperature stabilization, applying level displacement circuit to replace traditional voltage dividing resistance for decreasing temperature influence caused by area and resistance, varying value of parallel internal resistance at output end for realizing large variation of voltage value with temperature stabilization, setting startup and offset circuit to let circuit start up correctly.

Description

technical field [0001] The invention relates to the technical field of the power supply of an integrated circuit, especially the temperature stability of a reference voltage source. Background technique [0002] Voltage reference sources are widely used in many analog circuits and digital-analog hybrid circuits, such as: A\D, D\A converters, memories, etc. With the continuous reduction of process feature size, considering the reliability of the device, the power supply voltage allowed for circuit work must also be gradually reduced; at the same time, due to the gradual increase in transistor integration, the power consumption of the circuit must also be limited. Therefore, under the conditions of low voltage, low power consumption and increasingly harsh working environment, the requirements of the circuit system for the voltage reference source module are becoming more and more stringent. [0003] For the traditional bandgap reference source circuit, there are two obvious f...

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Problems solved by technology

Some reference source circuits for 1V power supply voltage have been reported, but these reference source circuits use Bipolar or BiCMOS technology, which is expensive, such as: P.Malcovati, F.Maloberti, et al. "Curvature compensated BiCMOS bandgap with 1-V supply voltage,” IEEE Journal of Solid-State Circuits, vol.37, pp.526-529, April 2002. Other reported CMOS reference source circuits have high temperature stability characteristics, but for those with temperature dependence The logarithmic term, they are only the first order, second order, or the corresponding curve correction, but not all offset the logarithmic term, such as: Hironori Banba, Hitoshi Shiga, et al. "A CMOS BandgapReference Circuit with Sub-1-v Operation," IEEE Journal of Solid-State Circuits, vol.34, no.5, May 1999. In the present invention, we propose a non-linear correction CMOS reference voltage source with a power supply voltage of 1V, trying to High temperature stability obtained by essentially canceling the logarithmic term with respect to temperature

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