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Negative temperature compensating current generating circuit and temperature compensating current reference source

A technology for compensating current and generating circuits, applied in the field of power supply, can solve the problem of not very good temperature characteristics

Inactive Publication Date: 2008-03-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This technical solution has been simulated by computer. In the range of -25°C to +75°C, the output reference current changes by 1.4%, or 140ppm, which shows that its temperature characteristics are not very good.

Method used

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  • Negative temperature compensating current generating circuit and temperature compensating current reference source
  • Negative temperature compensating current generating circuit and temperature compensating current reference source
  • Negative temperature compensating current generating circuit and temperature compensating current reference source

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Embodiment Construction

[0035] The specific implementation, structure and features of the utility model for high-order temperature compensation will be described in detail below in conjunction with the accompanying drawings.

[0036] The high-order temperature compensation principle of the current reference source is shown in Figure 1: the straight line a is the temperature characteristic curve of the first-order positive temperature compensation current, the curve b is the temperature characteristic curve of the second-order positive temperature compensation current, and the curve c is the third-order negative temperature compensation current. Temperature characteristic curve of temperature compensation current. Curve d is the output current temperature characteristic curve obtained by superimposing these three temperature compensation currents in a certain proportion. Considering various non-ideal effects in various integrated circuits, the curve c will not be a standard straight line in the end, a...

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Abstract

The negative temperature compensation current generation circuit and temperature compensation current reference source belong to the field of power supply technology, in the concrete, said invention relates to a temperature compensation current generation circuit and temperature compensation current reference source. The described negative temperature compensation current generation circuit is formed from a MOS transistor, a PNP triode and a resistor. The described temperature compensation current reference source includes starting circuit, first-order positive temperature compensation current generation circuit, second-order positive temperature compensation current generation circuit, third-order negative temperature compensation current generation circuit, proportional summation circuit and output circuit.

Description

technical field [0001] A negative temperature compensation current generation circuit and a temperature compensation current reference source belong to the technical field of power supplies, and specifically relate to a temperature compensation current generation circuit and a temperature compensation current reference source. Background technique [0002] A reference current source is required in analog, digital-analog hybrid, and even pure digital circuits, and the stability of the reference current source directly determines the performance of the circuit. The indicators describing the stability of the reference current source mainly include: power supply rejection ratio, temperature coefficient, etc. In order to meet the requirements of the circuit to work normally under harsh external temperature environment, the reference current source must have a very small temperature coefficient, that is, a very high temperature stability. [0003] The function of the current refe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/16
Inventor 卢杨张波李肇基
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA