CMOS subthreshold reference circuit with low power dissipation and low temperature drift

Abstract

The invention discloses a CMOS subthreshold reference circuit with low power dissipation and low temperature drift, and belongs to the technical field of power management. The CMOS subthreshold reference circuit comprises a starting circuit, a self-biasing V<PTAT> generation circuit, a square law current generation circuit and a reference voltage output circuit; the starting circuit can prevent the whole circuit from being in a zero state when a power supply is established and quits after the power supply is started; the self-biasing V<PTAT> generation circuit generates positive temperature coefficient voltage V<PTAT>; the square law current generation circuit generates a stream of currents proportional to muT<2>, wherein the currents are square law currents; lastly the square law currents are introduced into the reference voltage output circuit, and the final reference voltage VREF is obtained. The obtained reference voltage VREF can achieve the characteristics approximate to those at zero temperature within the temperature range of minus 40 DEGC to 100 DEG C; the problem that the temperature characteristics become poor due to temperature nonlinearity of carrier mobility is solved on the basis of a traditional subthreshold standard; the power dissipation is decreased from the muW magnitude to the nW magnitude, and low power dissipation is achieved.

Description

technical field [0001] The invention belongs to the technical field of power management, and in particular relates to the design of an ultra-low power consumption reference generation circuit based on a sub-threshold MOSFET. Background technique [0002] In the field of analog integrated circuit or mixed signal design, the reference voltage source is a very important and commonly used module. It is used in analog and digital converters, power converters, power amplifiers and other circuits. Voltage reference for supply voltage variations. With the continuous decline of power supply voltage, the design of reference source with low voltage, low power consumption, low temperature coefficient and high power supply rejection ratio becomes very critical. At present, it is of special and important significance to use a low-voltage power supply and a voltage reference circuit with lower power consumption. The increasing number of mobile electronic devices requires that the power s...

AI Technical Summary

Problems solved by technology

The traditional sub-threshold reference circuit ignores the change of m, resulting in its temperature characteristics not being optimized, or in other words, the application temperature range of the traditional sub-threshold reference source is narrow

On the other hand, the power consumption of sub-threshold reference sources at this stage is generally on the order of μW, and there is still a large room for optimization compared to nW or even pW.

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