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Boost operational amplifier

An operational amplifier and differential amplification technology, which is applied in the direction of amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of increasing size, reducing the performance of operational amplifiers, increasing current consumption, etc., to reduce short-circuit current and stabilize drive , to reduce the effect of offset

Inactive Publication Date: 2010-11-10
DONGBU HITEK CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

This means that externally connected capacitors (not shown in the diagram) are repeatedly charged and discharged, increasing current consumption
Also, if the size of the dead zone increases, the size of the effective bias increases, degrading the performance of the op amp

Method used

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  • Boost operational amplifier

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Embodiment Construction

[0028] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0029] Figure 4 is a block diagram of a boost operational amplifier 400 according to one embodiment of the present invention.

[0030] refer to Figure 4 , the step-up operational amplifier 400 includes: a differential amplification unit 410; first image processing units M3, M9, and M7; second image processing units M4, M5, M6, M10, and M8; pull-up transistor M11; pull-down transistor M12; capacitor C1 , a resistor R1 and a first current source IS1.

[0031] The differential amplification unit 410 amplifies and outputs the input differential voltages V+ and V−. The differential amplification unit 410 includes: a pair of differential input transistors M1 and M2, and a second current source IS2. In thi...

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Abstract

A boost operational amplifier. A boot operational amplifier may include a differential amplifying unit amplifying and / or outputting an inputted differential voltage, a first mirroring unit mirroring a current flowing through a first output terminal of a differential amplifying unit, which may output a mirrored first mirror current, a second mirroring unit mirroring a current flowing through a second output terminal of a differential amplifying unit, which may output a mirrored second mirror current, a pull-up transistor connected between a first power source and an output node, which may switch based on a first and / or a second mirror current, and / or a pull-down transistor connected between a second power source and an output node, which may switch based on a first and / or a second mirror current.

Description

[0001] This application claims priority from Korean Patent Application No. 10-2008-0135851 filed on December 29, 2008, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to an amplifier, and more particularly, to a boost operational amplifier. Background technique [0003] In general, boost op amps are frequently used to drive large resistive or capacitive loads. [0004] figure 1 is a configuration diagram of a boost operational amplifier according to the related art, and figure 2 yes figure 1 A diagram of the dead zone (quiet zone or insensitive zone, deadzone) of the boost op amp shown in . [0005] refer to figure 1 and figure 2 , In order to reduce the ripple of instant load switching (instant load switching, instant load switching), connect a capacitor (1nF ~ 100uF) for stabilization to the output node N of the boost operational amplifier to be used. [0006] This boost operational amplifier...

Claims

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Application Information

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IPC IPC(8): H03F3/45
CPCH03F3/303H03F2203/45212H03F3/45618H03F2203/45526H03F2203/45648H03F3/45183H03F1/02H03F3/45
Inventor 李元孝
Owner DONGBU HITEK CO LTD
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