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A High-order Curvature Corrected Reference Voltage Source

A technology of reference voltage source and order curvature, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve the problem of occupying circuit layout area, reduce layout area and design complexity, and simplify CTAT current generation Circuit, the effect of reducing the difficulty of design

Inactive Publication Date: 2018-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of obtaining CTAT current requires a separate CTAT current generation circuit, which will occupy a large amount of circuit layout area.

Method used

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  • A High-order Curvature Corrected Reference Voltage Source
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  • A High-order Curvature Corrected Reference Voltage Source

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] The high-order curvature correction reference voltage source architecture is attached figure 2 As shown, it includes a start-up module 201, a positive temperature current generation module 202, a shunt module 203, V TH A pre-compensation module 204 , a high temperature current compensation module 205 , a low temperature current compensation module 206 and a voltage superposition module 207 .

[0035] as attached image 3 As shown, the start-up circuit 201 is composed of MSP1, MSN1 and MSN2. Before the power supply voltage of the circuit is powered on, the reference voltage circuit is at the "0" degenerate bias point, the potential of the VQ node is low, the potential of the VBP node is high, and MSP1 and MSN2 constitutes an inverter, detects the VQ potential, turns on the MSN1 tube, pulls down the VBP node potential, and bre...

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PUM

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Abstract

The invention belongs to the technical field of analog integrated circuits, and in particular relates to a high-order curvature correction reference voltage source. The invention uses a simple shunt circuit to shunt the PTAT current to generate a CTAT current, simplifies the CTAT current generation circuit, reduces the layout area and design difficulty; introduces a new positive temperature voltage to pre-compensate the threshold voltage, Weaken the demand for the compensation capability of the post-stage compensation circuit to ensure that both PMOS transistors work in a normal saturation state; and use the segmented current curvature correction technology to obtain a high-order curvature correction output reference voltage. In addition, the reference voltage source of the present invention does not use resistors and operational amplifiers, which effectively reduces the layout area and design complexity of the entire reference circuit.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a high-order curvature correction reference voltage source. Background technique [0002] As one of the core modules in the analog circuit system, the reference voltage source provides an accurate reference voltage for the analog circuit system, and is widely used in analog and analog-digital hybrid systems such as analog-to-digital converters, power amplifiers, and data collectors. The system provides a reference voltage that does not vary with temperature. [0003] Due to the bipolar transistor base-emitter voltage V BE With negative temperature characteristics, the base-emitter voltage V of two bipolar transistors operating at different current densities BE The difference has a positive temperature characteristic, and the traditional bandgap reference voltage source proposed by Widlar and Brokaw uses these two voltages to compensate each other,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 宁宁张阳张启辉吴克军何广
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA