Band-gap reference source with low temperature drift coefficient

Abstract

The invention discloses a band-gap reference source with a low temperature drift coefficient, which comprises a band-gap reference core circuit, a resistance feedback network and an emitter local negative feedback network, the band-gap reference core circuit is composed of resistors R1, R2, R3 and R4 and bipolar transistors Q1 and Q2, and the resistance feedback network is composed of an operational amplifier A1 and resistors R5 and R6. The problem that a common reference voltage is high in temperature coefficient is solved, the temperature coefficient can be extremely low, the structure is simple, and the temperature compensation circuit has the advantages that the temperature drift coefficient of the circuit cannot be affected by large mismatch caused by the temperature compensation circuit, more accurate reference voltage can be achieved within the full temperature range. The temperature corresponding to the VBE is not a linear function, and the delta VBE can only linearly compensate the curve of the VBE, so that the Vref cannot be linear in the whole temperature range, and the compensation of the Vref full-temperature curve can be realized through the piecewise linear compensation method, so that the problem is well solved.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuit design, in particular to a bandgap reference source of low-temperature drift coefficient. Background technique [0002] An integrated circuit (integrated circuit) is a tiny electronic device or component. Using a certain process, the transistors, resistors, capacitors, inductors and other components required in a circuit are interconnected, and they are fabricated on a small or several small semiconductor wafers or dielectric substrates, and then packaged in a tube. , and become a microstructure with required circuit functions; all the components in it have been structurally integrated, making electronic components a big step towards miniaturization, low power consumption, intelligence and high reliability. It is represented by the letter "IC" in the circuit [0003] In integrated circuits, bandgap voltage references are an integral part of all analog circuits. Due to its very...

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Problems solved by technology

[0005] The temperature coefficient of the reference voltage cannot be done very well due to only first-order temperature curvature compensation

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