Band gap reference voltage circuit with high-order curvature compensation

A technology of curvature compensation and reference voltage, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problem that the temperature coefficient of the reference voltage is not very good, and achieve the effect of increasing power consumption

A technology of curvature compensation and reference voltage, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problem that the temperature coefficient of the reference voltage is not very good, and achieve the effect of increasing power consumption

CN102981545BInactive Publication Date: 2014-08-13东南大学无锡分校
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  • Band gap reference voltage circuit with high-order curvature compensation
  • Band gap reference voltage circuit with high-order curvature compensation

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing, the present invention will be further described.

[0025] The curvature compensation of the present invention is realized by using a subthreshold current that has a high-order function relationship with temperature, and this current increases as the temperature rises. By replacing the resistor in a small reference circuit with a MOS tube and making the MOS tube work in the weak inversion region, the circuit that originally generated the PTAT current can generate a subthreshold current. This subthreshold current is a higher-order function of temperature and increases with increasing temperature. The core reference circuit part generates a PTAT current and a current with a high-order negative temperature coefficient. The addition of these three currents can obtain an approximately temperature-independent current, thereby obtaining an output voltage with a lower temperature coefficient.

[0026] The overall circuit includes ...

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Abstract

The invention discloses a band gap reference voltage source with high-order curvature compensation. The voltage source comprises a curvature compensation circuit, a reference voltage generating circuit, a startup circuit and an error amplifier (A1), wherein the curvature compensation circuit comprises a zeroth PMOS (P-channel Metal Oxide Semiconductor) tube (PM0), a first PMOS tube (PM1), a zeroth NMOS (N-channel Metal Oxide Semiconductor) tube (NM0), a first NMOS tube (NM1), a second NMOS tube (NM2), a zeroth triode (Q0) and a first triode (Q1); and the reference voltage generating circuit comprises a second triode (Q2) for generating positive temperature coefficient voltage, a third triode (Q3), a zeroth resistor (R0) for generating positive temperature coefficient current, a first resistor (R1) for generating a negative temperature coefficient, a second resistor (R2) and the like. According to the band gap reference voltage source, reference voltage with a lower temperature coefficient can be achieved in a very large temperature range.

Description

technical field [0001] The invention relates to a high-order curvature compensation bandgap reference voltage circuit. The compensation current is a sub-threshold current. The current has a high-order positive temperature coefficient and is used to add a current with a negative temperature coefficient. The negative temperature coefficient current It has a high-order negative temperature coefficient, and the addition of the two can eliminate the high-order temperature coefficient of the current, thereby obtaining a stable output voltage at the output terminal. The circuit has the advantages of low temperature coefficient and low power consumption. Background technique [0002] The reference voltage source is an extremely important part of contemporary analog integrated circuits. It provides a reference voltage for series voltage regulator circuits, A / D and D / A converters, and is also a regulated power supply or excitation source for most sensors. In addition, the reference v...

Claims

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Application Information

Patent Timeline
13 Aug 2014
Publication
CN102981545B
IPC
G05F1/56
Inventors
吴建辉; 徐川