Low-power-consumption reference voltage source

Abstract

The invention provides a low-power-consumption reference voltage source which is simple in circuit structure, adjustable in output reference voltage and high in temperature stability. The technical scheme includes that in a main branch comprising a reference voltage generation circuit and a bias current generation circuit, a feedback branch is electrically connected between a grounding source electrode of an NMOS (N-channel metal oxide semiconductor) field effect transistor MN2 and a source electrode of a PMOS (P-channel metal oxide semiconductor) transistor MP4 and comprises an enhanced NMOS field effect transistor MN5, a divider resistor R1 and a resistor R2 which are sequentially connected in series, a grid electrode of the MN5 is electrically connected with a drain electrode of the MP4, a grid end of the MN2 is connected between the divider resistor R1 and the resistor R2, and the threshold voltage of the enhanced NMOS transistor MN2 and the threshold voltage of a depletion type NMOS transistor MN1 are linearly overlapped at a grid electrode of the MN2 by the MP4 to obtain reference voltage VREF outputted from a source electrode of the MN5.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuits, which are mainly used in analog and digital converters, power converters, power amplifiers and other circuits. The power supply voltage with low voltage and low power consumption characteristics is lower than 2.5V, and the maximum current consumption is less than 1μA the reference voltage source. Background technique [0002] The reference voltage source is an extremely important part of contemporary analog integrated circuits. It can provide a voltage reference that does not vary with temperature and power supply voltage for systems such as series regulator circuits, ADCs, and DACs. In the traditional design, the Zener breakdown characteristic of the Zener diode can be used to build a reference source that works near the breakdown voltage, but it has the disadvantages of high noise and being easily affected by the process. In order to maintain Zener breakdown, the Zener diode...

AI Technical Summary

Problems solved by technology

However, the E / D structure reference voltage source of the classic structure also has disadvantages: mainly the output reference voltage is not adjustable

However, the original circuit structure has too few adjustable parameters, which limits the application in mass production.

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