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Broadband shunt with gain buffer and adjusting method

A technology of gain buffer and shunt, which is applied in the electronic field, can solve the problem that the measurement accuracy of small current is affected by the electromagnetic environment, and achieve the effects of reduced amplitude error and phase error, wide frequency characteristic, and small temperature coefficient of resistance

Pending Publication Date: 2022-04-26
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Description
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  • Application Information

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Problems solved by technology

[0004] This application proposes a broadband shunt with a gain buffer and an adjustment method to solve the problem that the measurement accuracy of small currents is affected by the electromagnetic environment

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  • Broadband shunt with gain buffer and adjusting method
  • Broadband shunt with gain buffer and adjusting method
  • Broadband shunt with gain buffer and adjusting method

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Embodiment Construction

[0025] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0026] The technical solutions provided by various embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0027] like figure 1 Shown is a functional block diagram of a broadband shunt, including a shunt resistor unit 11, a gain buffer unit 12, and a voltage output unit (not shown in t...

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Abstract

The invention discloses a broadband shunt with a gain buffer. The broadband shunt comprises a resistor unit, the gain buffer and a voltage output unit which are connected in sequence. The gain buffer comprises three stages of amplifiers. Input voltage is input into the negative input end of the first amplifier, the positive input end of the second amplifier and the positive input end of the third amplifier in parallel. The first amplifier outputs a feedback positive input end, the second amplifier outputs a feedback negative input end, and the third amplifier outputs a feedback negative input end; the first amplifier outputs to a DC power supply common end of the second amplifier, and the second amplifier outputs to a DC power supply common end of the third amplifier; a load resistor is connected between the output end of the third amplifier and the ground. The gain buffer comprises an unloading circuit which is connected between the output end of the second amplifier and the output end of the third amplifier, so that the third amplifier is in a non-loaded state. The invention further provides an adjusting method of the broadband shunt with the gain buffer. The problem that the low-current measurement precision is influenced by an electromagnetic environment is solved.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to a broadband shunt with a gain buffer and an adjustment method. Background technique [0002] In high-precision current measurement, the function of the shunt is to convert the current into a voltage, and the error caused by the shunt dominates the measurement error. The wideband gain buffer is mainly used for mA level AC and DC current measurement. According to Ohm's law, a shunt is connected in series in the circuit, and the current value in the circuit is calculated by dividing the measured voltage by the resistance of the shunt. The measurement error of a shunt in the mA order is easily affected by external electromagnetic interference, noise and other factors. [0003] When measuring a small current, the resistance value is large, and the capacitance parameter of the shunt has a great influence, and the influence of the input capacitance of the voltmeter for m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R19/00G01R15/14
CPCG01R19/25G01R19/0092G01R15/146
Inventor 张建永彭婧宇胡耀元贾云涛
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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