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Current source device capable of regulating current intensity

A technology of current source and current adjustment, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of low reliability, complex design, large power consumption, etc., and achieve high working reliability, simple design, and reduced The effect of the device

Active Publication Date: 2010-09-08
NINGBO SEMICON INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this current source device can better realize the adjustment of the current size by changing the resistance value of the external resistor, due to the application of the operational amplifier, the current source device has many components, large power consumption, and complicated design. Disadvantages such as low reliability caused by complexity

Method used

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  • Current source device capable of regulating current intensity
  • Current source device capable of regulating current intensity
  • Current source device capable of regulating current intensity

Examples

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Effect test

Embodiment 1

[0024] A current source device with adjustable current, such as figure 2 As shown, it includes a current supply / limitation circuit IDC, a fixed voltage supply circuit VDC, a PMOS transistor P1, a first NPN transistor QN1, a second NPN transistor QN2 and an external resistor R1. The current supply / limitation circuit IDC has a first connection Terminal 1 and second connection terminal 2, the fixed voltage supply circuit VDC has a third connection terminal 3 and a fourth connection terminal 4, the first connection terminal 1 of the current supply / limitation circuit IDC is connected to the power supply voltage VDD, the current supply / limitation circuit IDC The second connection terminal 2 of the first NPN transistor QN1 is connected to the collector, the emitter of the first NPN transistor QN1 is connected to the third connection terminal 3 of the fixed voltage supply circuit VDC, and the first NPN transistor QN1 The bases are respectively connected to the collector of the first ...

Embodiment 2

[0032] A current source device with adjustable current, such as Figure 4 As shown, it includes a current supply / limitation circuit IDC, a fixed voltage supply circuit VDC, an NMOS transistor N1, a first PNP transistor QP1, a second PNP transistor QP2 and an external resistor R1. The current supply / limitation circuit IDC has a first connection Terminal 1 and second connection terminal 2, the fixed voltage supply circuit VDC has a third connection terminal 3 and a fourth connection terminal 4, the third connection terminal 3 of the fixed voltage supply circuit VDC is connected to the power supply voltage VDD, the first connection terminal of the fixed voltage supply circuit VDC The four connection terminals 4 are connected to the emitter of the first PNP transistor QP1, the collector of the first PNP transistor QP1 is connected to the first connection terminal 1 of the current supply / limiting circuit IDC, and the base of the first PNP transistor QP1 The poles are respectively c...

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PUM

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Abstract

The invention discloses a current source device capable of regulating current intensity, which mainly comprises a current supply / limiter circuit, a fixed voltage supply circuit, an MOS transistor, two triodes and an external resistor. The current source device can regulate the intensity of the bias current flowing through the MOS transistor by regulating the resistance value of the external resistor without using an operational amplifier in the existing current source device to follow the stable fixed voltage. Since the current source device does not need to use the operational amplifier, the number of units of the current source device is greatly reduced, the power consumption is effectively lowered, and the advantages of simple design and high operational reliability are achieved.

Description

technical field [0001] The invention relates to a current source device applied in the field of power supply, in particular to a current source device with adjustable current. Background technique [0002] In the field of power supply design of analog integrated circuit chips, in order to make the application range of analog integrated circuit chips more extensive, some internal current sources are often designed to be changeable, and users of analog integrated circuit chips can change the external current sources according to their own needs. The resistor is used to adjust the current of the current source. The usual method is to first use a bandgap reference to generate a stable level, then use an operational amplifier as a follower to follow the stable level, and then adjust the external resistor , an adjustable current source can be realized. [0003] figure 1 The circuit diagram of a typical current source device with adjustable current is given, which includes a fixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 孙腾达
Owner NINGBO SEMICON INT CORP