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Op Amps for Improved Slew Rate

An operational amplifier and coupling technology, used in DC-coupled DC amplifiers, differential amplifiers, instruments, etc., to achieve the effect of improving the slew rate

Inactive Publication Date: 2011-12-14
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides an operational amplifier, which is used to improve the slew rate (Slew Rate), thereby reducing the problem of power consumption

Method used

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  • Op Amps for Improved Slew Rate
  • Op Amps for Improved Slew Rate
  • Op Amps for Improved Slew Rate

Examples

Experimental program
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Embodiment Construction

[0049] figure 2 A circuit block diagram of an operational amplifier capable of improving slew rate according to an embodiment of the present invention is shown. Please refer to figure 2 , the operational amplifier 200 includes an input stage 210 and an output stage 220 . The input stage 210 receives one of the input voltages VIN1˜VINn, and generates an internal voltage Vi accordingly, where i=a positive integer of 1˜n. For example, when the input stage 210 receives the input voltage VIN1, it generates the internal voltage V1 correspondingly; when the input stage 210 receives the input voltage VIN2, it generates the internal voltage V2 correspondingly, and so on. The output stage 220 is used for receiving and gaining the internal voltage Vi to provide the output voltage VOUT.

[0050] In addition, the output stage 220 includes a transistor M1 , capacitors C1 -Cn and a switching unit 230 . The first source / drain terminal of the transistor M1 is coupled to a first voltage (...

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PUM

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Abstract

The invention relates to an operational amplifier with improved slew rate, which includes an input stage and an output stage. The input stage receives one of several input voltages and generates an internal voltage accordingly. The output stage receives and amplifies the internal voltage, and outputs an output voltage. The output stage includes a first transistor, a plurality of first capacitors and a first switching unit. A first source / drain terminal of the first transistor is coupled to a first voltage, and a gate terminal of the first transistor is controlled by the internal voltage. Wherein the output stage outputs the above output voltage according to the voltage of the second source / drain terminal of the first transistor. The first terminal of the first capacitor is coupled to the second source / drain terminal of the first transistor. The first switching unit selectively transmits the internal voltage to the second terminal of one of the corresponding first capacitors.

Description

technical field [0001] The present invention relates to an operational amplifier, and in particular to an operational amplifier capable of improving slew rate. Background technique [0002] Figure 1A A schematic diagram of a known source driver is shown. Please refer to FIG. 1, the source driver is used to receive a digital data Din to drive a panel (not shown), and the source driver includes a Gamma (Gamma) generator 110, an interface (Interface) circuit 120 and digital-to-analog conversion (Digital-to-Analog Converter, DAC) 130. The gamma generator 110 provides a plurality of gamma reference voltages to the digital-to-analog converter 130 . The digital-to-analog converter 130 selects one of the above-mentioned gamma reference voltages according to the digital data output by the interface circuit 120 . The DAC 130 outputs the selected gamma reference voltage to drive a panel (not shown). In addition, the gamma generator 110 can generate three sets of gamma reference vo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45G09G3/20G05F3/26
Inventor 王凌沄张耀光
Owner HIMAX TECH LTD
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