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A temperature compensated current generating circuit

A technology for generating circuits and temperature compensation, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve problems such as large total area, and achieve the effect of reducing the overall area

Active Publication Date: 2020-01-10
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a temperature-compensated current generating circuit to solve the problem of large total area in the prior art

Method used

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  • A temperature compensated current generating circuit
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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0028] The invention provides a temperature-compensated current generating circuit to solve the problem of large total area in the prior art.

[0029] Specifically, the temperature-compensated current generating circuit, such as figure 2 As shown, it includes: the first MOS transistor PM1, the second MOS transistor PM2, the third MOS transistor PM3, the resistor R1 and the operational amplifier X1; where:

[0030] The source of the first MOS transistor PM1 receives the first power supply ...

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Abstract

The invention provides a current generation circuit with a temperature compensating function. Voltage between a first MOS tube and a second MOS tube is applied to a resistor through a negative feedback effect of an operational amplifier. Voltage between the first MOS tube and the second MOS tube is anti-phase input-end voltage of the operational amplifier. The temperature coefficient of the voltage offsets the temperature coefficient of the resistor in order to generate steady current which changes little with temperature. Moreover, the current generation circuit with the temperature compensating function achieves the above-mentioned principle with MOS tubes as basic elements. Compared with the prior art, the overall area of the circuit is decreased.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a temperature-compensated current generating circuit. Background technique [0002] It has always been a requirement in analog circuits to generate stable reference voltages and reference currents that vary little with temperature. A stable reference voltage or reference current, used as an input bias signal for other circuits, has an important impact on the final characteristics of the circuit. [0003] A common method in the prior art is to use BGR (bandgap reference) to generate bias voltage and bias current, see figure 1 ; It mainly uses the negative temperature characteristic of the voltage Vbe between the base and the emitter of the triode, and the positive temperature characteristic of △Vbe between the two triodes to realize temperature compensation, and then generate a constant voltage or current. [0004] but if figure 1 In the prior art solution shown, beca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 陈丹凤
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP