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Researchers Submit Patent Application, "Amplifier, Fully-Differential Amplifier and Delta-Sigma Modulator", for Approval

May 7, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors HO, Chen-Yen (New Taipei City, TW); LO, Chi-Lun (Yangmei Township, TW); TSAI, Hung-Chieh (Tainan City, TW); LIN, Yu-Hsin (Taipei City, TW), filed on December 19, 2013, was made available online on April 24, 2014.

The patent's assignee is MediaTek Inc.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to an amplifier, a fully-differential amplifier and a delta-sigma modulator, and in particular relates to a push-pull amplifier design.

"Amplifiers are among the most widely used electronic devices today, used in a vast array of consumer, industrial and scientific devices. When designing an amplifier, several considerations should be taken into account, including power efficiency, output driving capability, circuit size and operational speed and so on. An amplifier design with high power efficiency, reliable output driving capability, a small circuit size and fast operational speed is called for."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "An amplifier, a fully-differential amplifier and a delta-sigma modulator are disclosed.

"An amplifier in accordance with an exemplary embodiment of the invention comprises a front-end gain stage, an AC-coupled push-pull output stage and a compensation circuit. The AC-coupled push-pull output stage comprises a first transistor, a second transistor, an AC-coupled capacitor and a resistance component. The first transistor has a source, a drain and a gate, wherein the source of the first transistor is coupled to a first voltage level. The second transistor has a source, a drain and a gate, wherein the source of the second transistor is coupled to a second voltage level, the gate of the second transistor is coupled to the front-end gain stage, and the drain of the second transistor is coupled to the drain of the first transistor to form an output terminal of the amplifier. The AC-coupled capacitor (which is a passive two terminal electrical component rather than a stray or parasitic capacitance of a transistor) is coupled between the front-end gain stage and the gate of the first transistor. By the resistance component, the gate of the first transistor is coupled to a bias voltage level, and, the compensation circuit is coupled between the front-end gain stage and the output terminal of the amplifier.

"In another exemplary embodiment, a fully-differential amplifier is introduced, wherein the aforementioned AC-coupled push-pull output stage is used in both the positive and negative outputs of the fully-differential amplifier.

"In another exemplary embodiment, a delta-sigma modulator is provided. The delta-sigma modulator comprises a feed-forward loop filter, a quantizer, a z-delay component, a first digital-to-analog converter and a second digital-to-analog converter. The quantizer is coupled after the feed-forward loop filter. The z-delay component couples an output signal of the quantizer to the first and second digital-to-analog converters, respectively, to feedback control the feed-forward loop filter and the quantizer. The feed-forward loop filter comprises a plurality of integrators, wherein at least one of the plurality of integrators comprises the aforementioned fully-differential amplifier.

"A detailed description is given in the following embodiments with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

"The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

"FIG. 1 depicts an amplifier in accordance with an exemplary embodiment of the invention, which includes the disclosed AC-coupled push-pull output stage having an AC-coupled capacitor (which is a passive two terminal electrical component rather than a stray or parasitic capacitance of a transistor) coupled between the front-end gain stage and a gate of a top or a bottom transistor of a push-pull structure;

"FIG. 2A depicts an amplifier in accordance with an exemplary embodiment of the invention, wherein the AC-coupled capacitor is coupled between the front-end gain stage and the gate of the top transistor of the push-pull structure;

"FIG. 2B depicts an amplifier in accordance with an exemplary embodiment of the invention, wherein the AC-coupled capacitor is coupled between the front-end gain stage and the gate of the bottom transistor of the push-pull structure;

"FIG. 3 depicts a fully-differential amplifier in accordance with an exemplary embodiment of the invention; and

"FIG. 4 depicts a delta-sigma modulator in accordance with an exemplary embodiment of the invention."

For additional information on this patent application, see: HO, Chen-Yen; LO, Chi-Lun; TSAI, Hung-Chieh; LIN, Yu-Hsin. Amplifier, Fully-Differential Amplifier and Delta-Sigma Modulator. Filed December 19, 2013 and posted April 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5280&p=106&f=G&l=50&d=PG01&S1=20140417.PD.&OS=PD/20140417&RS=PD/20140417

Keywords for this news article include: Electronics, MediaTek Inc, Digital To Analog.

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Source: Electronics Newsweekly


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