Operational-amplifier-free high-order low-temperature-drift bandgap reference circuit

A reference circuit, low-temperature drift technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of increasing chip area, restricting the development needs of integrated circuits, and complicated and difficult circuit design, etc., to achieve extremely low power consumption Effect

Pending Publication Date: 2018-05-18
CHENGDU UNIV OF INFORMATION TECH
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  • Abstract
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  • Claims
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Problems solved by technology

In order to obtain a high-performance bandgap reference voltage in a traditional circuit, a high-performance operational amplifier is required to stabilize the voltage in the circuit design, which not only increases the difficulty of the design, but also increases the complexity of the circuit design, and the structure of the operational amplifier occupies a large chip area. Increase the design cost, which seriously restricts the development needs of integrated circuit miniaturization; at the same time, the minimum operating vol

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  • Operational-amplifier-free high-order low-temperature-drift bandgap reference circuit
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  • Operational-amplifier-free high-order low-temperature-drift bandgap reference circuit

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[0049] specific implementation plan

[0050] The specific examples that follow represent exemplary embodiments of the invention and are illustrative rather than limiting in nature. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details are not necessary to the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0051] In the specification, reference to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. The appearances of the term "in one embodiment" in various places in the specification are not all referring to the same embodiment...

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Abstract

The invention discloses an operational-amplifier-free high-order low-temperature-drift bandgap reference circuit. The reference circuit comprises a starting circuit, a bias circuit, a positive temperature coefficient circuit, a negative temperature coefficient circuit, a positive temperature coefficient compensation circuit and a negative temperature coefficient compensation circuit. The operational-amplifier-free high-order low-temperature-drift bandgap reference circuit adopts an operational-amplifier-free circuit structure, and the power supply rejection ratio (PSRR) of an output referencevoltage is increased by a BJT current mirror. The circuit provided by the invention has the characteristics of wide voltage input of 12 to 36V, width-adjustable output voltage of 0 to 7V, generation of a reference voltage of 5ppm/DEG C in the temperature range of 75 to 125 DEG C, extremely low power consumption of 35mW and high-order temperature compensation.

Description

technical field [0001] The invention belongs to the field of integrated circuits and relates to a bandgap reference circuit without high-order low-temperature drift of operational amplifiers. Background technique [0002] As a high-precision ADC, DAC converter and a basic component in communication circuits, the bandgap reference circuit provides an accurate voltage source or current source for other circuit modules. With the rapid development of system integration technology, the reference voltage source has become an indispensable basic circuit module in large-scale, VLSI and almost all digital and analog systems. Its temperature characteristics and anti-noise ability are key factors affecting the accuracy and performance of integrated circuits. The traditional bandgap reference circuit produces a reference voltage with a temperature coefficient of about 50ppm / °C in the temperature range of 0-70°C. In high-precision ADCs, DAC converters, and circuit modules with high-per...

Claims

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Application Information

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IPC IPC(8): G05F3/26
CPCG05F3/26Y02B70/10
Inventor 杨燕赵健雄李英祥王天宝
Owner CHENGDU UNIV OF INFORMATION TECH
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