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Bandgap reference circuit, integrated circuit and method for generating a bandgap reference voltage

A reference circuit and circuit technology, applied in the field of circuits, can solve the problems such as the decrease of the accuracy of the bandgap reference circuit

Active Publication Date: 2016-08-24
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in a practical circuit, the operational amplifier OP is affected by offset voltage and low-frequency flicker noise, making it impossible to operate according to the characteristics of an ideal operational amplifier, thereby degrading the accuracy of the bandgap reference circuit

Method used

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  • Bandgap reference circuit, integrated circuit and method for generating a bandgap reference voltage

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Embodiment Construction

[0116] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.

[0117] figure 2 is a schematic circuit diagram of the bandgap reference circuit of the first embodiment of the present invention. Such as figure 2 As shown, the bandgap reference circuit 20 includes a first voltage output circuit 21, a second voltage output circuit 22, a first capacitor C1, a second capacitor C2, a third capacitor C3, a mode control circuit and an operational amplifier OP1.

[0118] For an ideal op amp, if its two inputs have exactly the same voltage, the output should be 0V. For the operational amplifier in the actual circuit, due to the existence of temperature drift, it needs to input a differential voltage to ensure that the output is 0V. The...

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Abstract

The invention relates to a bandgap reference circuit, an integrated circuit and a method for generating a bandgap reference voltage. The bandgap reference circuit includes a first voltage output circuit, a second voltage output circuit, a first capacitor, a second capacitor, and a third capacitor , mode control circuit and operational amplifier. The mode control circuit enables the bandgap reference circuit to switch between different modes. In the first mode, capacitors are used to sample the offset voltage and low-frequency flicker noise, and in the second mode, the result obtained by sampling is used to compensate, thereby eliminating the need for calculation The amplifier's offset voltage and low-frequency flicker noise have a negative impact on the circuit, so that the output bandgap reference voltage is not disturbed.

Description

technical field [0001] The invention relates to circuit technology, in particular to a bandgap reference circuit, an integrated circuit containing it and a method for generating a bandgap reference voltage. Background technique [0002] The bandgap (bandgap) reference circuit is used to provide a reference voltage that does not change with temperature for the circuit. figure 1 is a schematic circuit diagram of an existing bandgap reference circuit 10 . Such as figure 1 As shown, by setting transistors Q1, Q2 as the same transistor, and setting the current ratio of current sources I1 and I2 as n:1, the emitter voltage v of transistor Q1 BE1 (that is, the PN junction voltage) and the emitter voltage v of transistor Q2 BE2 (that is, the PN junction voltage) satisfies: [0003] v BE1 -v BE2 =v T ln(n) [0004] Among them, v T (=k·T / q) is the thermal voltage of the transistors Q1, Q2. k is Boltzmann's constant, equal to 1.38×10 -23 , T is the absolute temperature, q is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 周健胡铁刚
Owner HANGZHOU SILAN MICROELECTRONICS