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Two-stage low-noise high-current high-resolution numerical control current source

A current source and low-noise technology, applied in the field of electronics, can solve the problems of limited system noise, small current source control voltage noise, difficult output capability of current source, and difficulty in reaching low noise output level, etc.

Active Publication Date: 2020-10-30
JILIN UNIV
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Problems solved by technology

It is difficult for general current source technology to achieve low noise output level due to device noise limitation when the current is large, and it is difficult for a current source with low noise level to have high output capability at the same time
[0003] Grzegorz Dudzik of the Wroclaw University of Technology in Poland once proposed a two-stage low-noise current source structure, using a small current source in parallel with a large current source, so that the small current source compensates the noise of the large current source, but the final system noise Control voltage noise limited by small current sources

Method used

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  • Two-stage low-noise high-current high-resolution numerical control current source
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  • Two-stage low-noise high-current high-resolution numerical control current source

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Embodiment Construction

[0031] see figure 2 As shown, a two-stage low-noise high-current high-resolution numerical control current source includes: one-stage high-current source 12, two-stage low-noise current source 11, one-stage high-current source and two-stage low-noise current source, described The output current I of the first-stage high-current source output 1 And it is converted into a voltage value through feedback, and the control voltage U output by a large current source 1 is compared, the compared error on the output current I 1 Make feedback adjustments;

[0032] The secondary low-noise current source, the output compensation current I 2 , with the output current I 1 After superposition, the output is the output current I out , and feed back the output current I out Converted into a voltage with a primary current source control voltage U 1 After doing the difference with the secondary low noise current source control voltage U 2 are compared, the compared error against the comp...

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Abstract

The invention discloses a two-stage low-noise high-current high-resolution numerical control current source which comprises a first-stage high-current source and a second-stage low-noise current source. The two stages of current sources form a parallel structure, and low-noise small current generated by the second-stage low-noise current source compensates fluctuation of output current of the first-stage large current source, so that overall output of the system tends to be stable, and the noise level and resolution of the low-noise current source are kept while the large-current output capacity is achieved. The method is suitable for the field with high requirements on the current source driving capability and the current noise level.

Description

technical field [0001] The invention belongs to the field of electronics, and in particular relates to a two-stage low-noise high-current high-resolution digital control current source. It is suitable for fields that require high current source driving capability and current noise level. Background technique [0002] Many applications require practical low noise digitally controlled current sources. For example, the semiconductor laser diode excitation method mostly adopts the current injection method. To obtain stable output power, a low-noise current source must be used. At the same time, the output capability of the current source determines the upper limit of the laser output power, and the current resolution of the current source determines the laser output power. resolution. In the field of magnetic measurement, the unshielded SERF atomic magnetometer based on active magnetic field cancellation uses a cancellation coil to compensate the ambient magnetic field. The no...

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Application Information

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IPC IPC(8): G05F1/46
CPCG05F1/461G05F1/467
Inventor 王言章秦佳男陈晨孙永泽
Owner JILIN UNIV