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No-resistor-type high-precision low-power-consumption reference source

A high-precision, low-power technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of inability to meet the requirements of high precision and high power supply rejection ratio, so as to reduce design cost, reduce drift, The effect of reducing chip area

Active Publication Date: 2017-11-10
天津应大科讯电气设备有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to solve the restrictive relationship between the power consumption and performance of the existing reference source, especially the low power consumption cannot meet the requirements of high precision and high power supply rejection ratio

Method used

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0031] The circuit diagram of the resistance-free high-precision reference source proposed by the present invention is as follows figure 2 As shown, it includes a startup circuit, a bias current generation circuit, a reference voltage generation circuit, a high-order compensation circuit, and a low-pass filter circuit. The startup circuit in this embodiment includes a first NMOS tube MN1, a first PMOS tube MP1, and a second PMOS tube MP2, the gate of the second PMOS tube MP2 is connected to the gate of the first NMOS tube MN1 and the drain of the first PMOS tube MP1, and the drain is used as the output terminal of the startup circuit; the first PMOS tube MP1 and the first PMOS tube MP1 The source of the two PMOS transistor MP2 is connected to the power supply voltage VDD, the drain and source of the first NMOS transistor MN1 and the gate of the first PMOS tran...

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Abstract

The invention provides a no-resistor-type high-precision low-power-consumption reference source, and belongs to the technical field of power management. A starting circuit enables a reference circuit to work normally during the circuit initialization phase, and reference current generated by a bias current generating circuit is used as the bias current of a reference voltage generating circuit, and meanwhile used as the bias current of a high order compensation circuit; the generated bias current can achieve high order compensation and meet self-bias demands; in the reference voltage generating circuit, the negative temperature coefficient voltage generating part uses the bias current as the collector current of a BJT, and compared with the traditional VBE, an obtained negative temperature coefficient voltage VCTAT greatly reduces the negative temperature characteristics of the VBE; a positive temperature coefficient voltage VPTAT and the negative temperature coefficient voltage VCTAT are superposed to obtain the reference voltage. In addition, the high order compensation circuit is introduced to obtain the reference voltage with better temperature characteristics, and the output part is added with a low-pass filter circuit to improve the power supply rejection ratio PSRR of the reference circuit. The reference source can achieve nanowatt-level power dissipation, and no resistance is arranged, which reduces the chip area.

Description

Technical field [0001] The invention belongs to the technical field of power management, and specifically relates to the design of a resistance-free high-precision low-power consumption reference source circuit. Background technique [0002] As the core module of the electronic system, the reference source is in many circuits such as analog-to-digital converter (ADC), digital-to-analog converter (DAC), linear regulator, switching regulator, temperature sensor, rechargeable battery protection chip and communication circuit An indispensable part to provide an accurate and stable reference signal source for the circuit. [0003] As electronic systems, especially battery-powered or self-powered systems, such as environmental sensor networks, energy harvesting systems, bioelectronic systems, etc., have increasingly urgent requirements for low voltage and low power consumption, reduce the power consumption of the reference source and maintain the stability of the reference source It has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 石跃曹建文孙庆吉周泽坤凌味未
Owner 天津应大科讯电气设备有限公司
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