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Cyclic dynamic matching current source circuit

A dynamic matching, current source technology, applied in the field of circuits, can solve the problem of high cost

Active Publication Date: 2022-05-17
深圳市山海半导体科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the matching accuracy of the two current sources is mainly improved by increasing the area of ​​the current source device. Since the matching accuracy is proportional to the square of the device area, the cost of this solution is too high.

Method used

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  • Cyclic dynamic matching current source circuit
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Embodiment Construction

[0026] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. 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.

[0027] In the following detailed description, reference is made to the accompanying drawings which are included in the specification and which illustrate specific embodiments of the application and which are included in this application. In the drawings, like reference numerals describe substantially similar components in different views. Various spe...

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Abstract

The invention provides a method for circularly and dynamically matching current sources, which comprises the following steps of: providing 2n same unit current sources with fixed serial numbers, and n is an integer greater than 1; the method comprises the following steps: receiving a clock signal, adding 1 to a pointer value when an effective level of the clock signal arrives, generating two paths of switch control signals according to the current pointer value and a preset rule, and returning to 1 and restarting circulation after the value of the pointer reaches n; based on the two paths of switch control signals, two groups are selected from the 2n unit current sources respectively, each group comprises n unit current sources, the sum of the two groups of unit current sources generates a first current and a second current respectively, and the serial numbers of the unit current sources included in the two groups at the same moment are different from each other; and respectively carrying out the same low-pass filtering operation on the first current and the second current so as to output two paths of matched current.

Description

technical field [0001] The present application relates to a circuit, in particular to a current source circuit for cyclic dynamic matching. Background technique [0002] Many medical, process control, and industrial automation applications require accurate temperature measurement to function. A resistance temperature detector (RTD) is a special resistance whose resistance value increases as the temperature increases and decreases as the temperature decreases. The industry uses this characteristic of RTD for temperature measurement. Therefore, RTD is also commonly known as "thermal resistance". Because RTDs have a wide temperature measurement range, good linearity, and excellent long-term stability and repeatability, they are usually used as sensing elements in various applications that require accurate temperature measurement to achieve high-precision temperature measurement. [0003] According to the number of leads drawn from the RTD thermal resistance, RTDs can be divid...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 王照钢杨励
Owner 深圳市山海半导体科技有限公司