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Current mirror circuit, driving circuit using the same,and method of driving the circuit

A driving circuit and driver technology, applied in amplifiers with semiconductor devices/discharge tubes, electrical components, adjusting electrical variables, etc.

Active Publication Date: 2009-03-18
SAMSUNG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is especially problematic when a current mirror circuit is used as a current-sensitive element such as a pixel in a light-emitting display, because any deviation in current due to the different threshold voltages of transistors M1 and M2 can cause serious problems

Method used

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  • Current mirror circuit, driving circuit using the same,and method of driving the circuit
  • Current mirror circuit, driving circuit using the same,and method of driving the circuit
  • Current mirror circuit, driving circuit using the same,and method of driving the circuit

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Embodiment Construction

[0027] Referring to the accompanying drawings below, that is image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 , to describe preferred embodiments according to the present invention.

[0028] see image 3 , the current mirror circuit constructed according to an embodiment of the present invention includes transistors M1 and M2 electrically connected to each other. The current mirror circuit may further include a compensator 10 for compensating the threshold voltage of each of the transistors M1 and M2. Each of transistors M1 and M2 includes a first terminal, a second terminal and a gate terminal.

[0029] A first terminal of the first transistor M1 may be electrically connected to a voltage source VDD, and a second terminal and a gate terminal of the transistor M1 may be electrically connected to each other. In operation, a current flows through the transistor M1 so that the transistor M1 acts as a diode, thereby enabling t...

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PUM

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Abstract

A current mirror circuit is disclosed that is capable of supplying a desired second current regardless of whether the threshold voltages of the current mirror circuit's transistors are the same or different. The current mirror circuit includes a first transistor whose first terminal is electrically connected to a voltage source and whose gate terminal and second terminal are electrically connected to each other. A second transistor has a first terminal electrically connected to the voltage source and a gate terminal electrically connected to the gate terminal of the first transistor. A compensator that compensates for different threshold voltages of each of the first transistor and the second transistor is also included. Because differences in the threshold voltages of the transistors connected to the current mirror are compensated for, embodiments of the invention are able to generate a desired second current that can be used to power a driver or similar device. Additionally, the invention's current mirror circuit may function as a bias unit so that a driving circuit can be stably driven.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to and benefits from Korean Patent Applications 2004-95982 and 2004-96377 filed with the Korean Intellectual Property Office on Nov. 22, 2004 and Nov. 23, 2004, respectively, which are hereby incorporated by reference in their entirety incorporated in this article. technical field [0003] The present invention relates generally to a current mirror circuit and a method of driving the same, and more particularly, to a current mirror circuit capable of supplying a desired current corresponding to a first current without being limited by a drive circuit included in the current mirror circuit. Contains the influence of one or more transistors on the threshold voltage. The invention further relates to a method of driving a drive circuit comprising a current mirror circuit constructed according to the principle of the invention. Background technique [0004] A current mirror circuit is a ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCG05F3/262H03F3/345H03F3/4547
Inventor 金阳完权五敬
Owner SAMSUNG DISPLAY CO LTD