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Differential voltage absolute value circuit

An absolute value circuit and differential voltage technology, applied in electrical components, pulse processing, pulse shaping, etc., can solve problems such as poor performance of voltage absolute value circuits, and achieve the effect of small quantity and simple structure

Active Publication Date: 2016-06-01
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the invention is that the performance of the voltage absolute value circuit in the prior art is poor

Method used

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Embodiment Construction

[0020] It can be seen from the background art that the differential absolute value circuit formed in the prior art has poor performance.

[0021] The inventors of the present invention have studied the differential absolute value circuit in the prior art, and found that the differential absolute value circuit in the prior art has problems such as complex structure, dual power supply, and large error. Specifically, refer to figure 1 , figure 1 A schematic structural diagram of a differential absolute value circuit in the prior art is shown. The op amp OP10 and the resistors R10, R20, Rf0 or Rd0 form a voltage difference circuit, and the two input voltages VIN10 and VIN20 are respectively input through the resistors R10 and R20 and the inverting input and non-inverting input of the op amp OP10; the voltage at point A V ( A ) = ( R 20 / / ...

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Abstract

Provided in the invention is a differential voltage absolute value circuit comprising a first voltage-current conversion module, a second voltage-current conversion module, a first current subtraction module, a second current subtraction module, a current adding module, and a current-voltage conversion module. The two voltage-current conversion modules convert a first input voltage and a second input voltage into a first current and a second current; the two currents are inputted into the two current subtraction modules by a reversed connection way to obtain two difference currents; summation is carried out on the difference currents outputted by the two current subtraction modules by the current adding module to obtain an adding sum current, wherein the adding sum current is an absolute value of difference values of the first current and the second current; and then the adding sum current is converted into a voltage by the current-voltage conversion module to obtain a differential voltage absolute value of the first input voltage and the second input voltage. According to the invention, the provided differential voltage absolute value circuit has advantages of simple structure and low error.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a differential voltage absolute value circuit. Background technique [0002] Differential voltage absolute value circuits are widely used in the fields of measurement and control. For example, high-quality regulated power supplies are controlled by sine wave pulse width pulse width modulation, and voltage absolute value circuits are required. The existing classic voltage absolute value operation circuit is mainly composed of dual power supply operational amplifiers with resistors and diodes. In order to improve the integration of the power supply control chip, it is necessary to integrate the resistors and diodes into the chip using CMOS technology, but more resistors and diodes lead to a complex structure of the absolute value circuit and low precision. [0003] Therefore, the performance of the voltage absolute value circuit in the prior art is not good. Contents of the in...

Claims

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Application Information

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IPC IPC(8): H03K5/02
CPCH03K5/023
Inventor 秦义寿
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP