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Bandgap reference circuit employing current subtraction technology

A reference circuit and current technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as limited applications, and achieve the effect of low power supply voltage and low temperature coefficient

Active Publication Date: 2011-11-23
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the power supply voltage of the traditional bandgap reference circuit is generally above 1.2V, which limits its application in low power supply voltage circuits.

Method used

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  • Bandgap reference circuit employing current subtraction technology
  • Bandgap reference circuit employing current subtraction technology
  • Bandgap reference circuit employing current subtraction technology

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Embodiment Construction

[0028] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] figure 2 It is a schematic diagram of a negative temperature coefficient (CTAT) current generating circuit of the present invention, wherein the dimensions of the PMOS transistors PMa and PMb are exactly the same. If the amplifier OPA is an ideal operational amplifier, then the voltages at both inputs of OPA are equal:

[0030] Va=Vb (4)

[0031] PMa and PMb form a current mirror, and the current I flowing through the two branches of the current mirror Q and I R equal:

[0032] I Q =I R (5)

[0033] In the present invention, the diode is realized in the way that the base-collector of the triode is shorted and the base-emitter is connected. figure 2 , the emitter-base voltage of the PNP transistor can be expressed as:

[0034] V EB = V G ...

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Abstract

The invention discloses a bandgap reference circuit employing a current subtraction technology. Temperature compensation is realized by the current subtraction technology. The bandgap reference circuit comprises two current generating circuits with CTAT (Complementary To Absolute Temperature) and a current subtraction circuit, wherein each of the current generating circuits with the CTAT consists of two P-channel metal oxide semiconductor (PMOS) pipes, an operation amplifier (OPA), a resistor and a triode; and the current subtraction circuit consists of two PMOS pipes, two N-channel metal oxide semiconductor (NMOS) pipes and a resistor. The circuit acquires relatively stable bandgap reference through current subtraction of the two current generating circuits with the CTAT, and has the advantages of low temperature coefficient, low needed supply voltage (less than 1V) and the like.

Description

technical field [0001] The invention relates to the technical field of bandgap reference circuits, and relates to a bandgap reference circuit based on the subtraction of two currents with the same temperature coefficient but different amplitudes. Background technique [0002] In the field of integrated circuit design, voltage reference circuits can provide circuits and systems with reference voltages that do not vary with temperature and power supply voltage, and are widely used in various digital and analog circuits, such as ADCs, radio frequency receivers, frequency synthesizers, filters Waiting for the circuit. [0003] The working principle of the traditional bandgap reference circuit is based on a positive temperature coefficient (PTAT, Proportional To Absolute Temperature) voltage (the difference between the voltages across the two diodes dV f ) with a negative temperature coefficient (CTAT) voltage (the voltage across the diode V f ) weights to get a voltage that ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/30
Inventor 杨海钢朱文锐尹韬高同强
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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