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High-voltage wide-input-range current sampling operational amplifier circuit

A current sampling, operational amplifier circuit technology, applied in the direction of measuring current/voltage, amplifier protection circuit layout, amplifiers with at least 3 electrodes or two PN junctions, etc., can solve the problem that the GND to VCC input detection function cannot be accurately realized And other issues

Active Publication Date: 2019-11-29
58TH RES INST OF CETC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a high voltage wide input range current sampling operational amplifier circuit to solve the problem that the existing current sampling operational amplifier cannot accurately realize the input detection function in the range from GND to VCC

Method used

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Embodiment 1

[0032] The present invention provides a high-voltage wide input range current sampling operational amplifier circuit, which includes a common-mode level detection branch to realize the free switching of the input stage state, and can accurately realize the input detection function in the range from the ground GND to the external power supply VCC. Specifically, the input stage is composed of horizontal PNP transistors, compared with the input stage composed of MOS transistors, without increasing the turn-on threshold, the maximum withstand voltage characteristic between the positive and negative terminals of the current sampling operational amplifier can be greatly improved; its After the input stage is freely switched through the common-mode level detection branch, the bias current structure of the input stage of the current sampling op amp can be simplified, and the chip area and cost can be reduced; by adding R11, R12, Q11, Q12, Q13, Q14, The positive feedback acceleration br...

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Abstract

The invention discloses a high-voltage wide-input-range current sampling operational amplifier circuit, and belongs to the technical field of electronic circuits. The high-voltage wide-input-range current sampling operational amplifier circuit comprises a common-mode level detection branch circuit, is used for realizing the free switching of input stage states, and can accurately realize the inputdetection function from a ground GND to an external power VCC range. Specifically, the input stage is formed by adopting a transverse PNP triode, and compared with the input stage formed by an MOS transistor, the maximum voltage withstanding characteristic between the positive end and the negative end of a current sampling operational amplifier can be greatly improved on the premise of not increasing a starting threshold; and after the input stage is freely switched through the common-mode level detection branch, a current sampling operational amplifier input stage bias current structure canbe simplified, and the chip area and the cost are reduced.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a high voltage wide input range current sampling operational amplifier circuit. Background technique [0002] With the rapid development of semiconductor integrated circuit technology, in addition to low-voltage fields such as mobile phones and mobile devices, power integrated circuits have become more and more widely used in high-voltage and high-power applications such as high-speed rail and IGBT. In order to increase the reliability of high-voltage power integrated circuits, it is usually necessary to monitor its output current in real time. When the output current exceeds the upper limit of the rated operating value, the output power tube will be shut down immediately to prevent the chip from being burned due to severe heat generation of the power tube. [0003] The implementation of current monitoring in traditional high-voltage power integrated circuits is as f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R1/30G01R19/165G01R19/04H03F1/52H03F3/14
CPCG01R1/30G01R19/04G01R19/165G01R19/16557H03F1/52H03F3/14
Inventor 奚冬杰徐晴昊
Owner 58TH RES INST OF CETC