The frequency characteristic of a voltage-feedback class-D amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a PWM carrier to a comparison circuit for performing PWM modulation of an input …

Legal parties

Inventors (applicants): Naoya Odagiri
Assignees (initial): Renesas Electronics Corporation (Kawasaki-Shi, Kanagawa, JP)
Agents: McDermott Will & Emery LLP (attorney)

The application was examined by Levi Gannon (USPTO dept. 2843)


  • 1. An amplifier circuit comprising: …
  • 2. The amplifier according to claim 1 , …

International priority data

JP: 2009-147640 / Jun. 22, 2009 (national)

Cited documents


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Brief Description of the Drawings

FIG. 1 is a conceptual diagram illustrating configuration of an output load driving device according to the present invention; FIG. 2 is a timing chart illustrating operation of the output …


Background of the Invention

The present invention relates to a pulse width modulation circuit and a voltage-feedback class-D amplifier circuit using the same, especially, relates to configuration for improving the frequency characteristic of a circuit …

Cross Reference to Related Applications

This application is a Continuation of U.S. application Ser. No. 12/794,156, filed on Jun. 4, 2010, now U.S. Pat. No. 8,115,563 which claims priority of Japanese Patent Application No. 2009-147640 …

Fundamental Configuration

FIG. 1 illustrates roughly entire configuration of an output load driving device according to the present invention. In FIG. 1 , the output load driving device 1 drives an inductive …

More details about Pulse Width Modulation Circuit and Voltage-Feedback Class-D Amplifier Circuit

Miscellaneous patent data

Illustrated by 20 drawings, the application was published on Jan. 11, 2012, the invention is titled Pulse Width Modulation Circuit and Voltage-Feedback Class-D Amplifier Circuit, similar classification categories are Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics, using transformer coupling, Modifications of amplifiers to extend the bandwidth, Carrier output suppressed during absence of modulating signal, Input circuits, using a single tube with positive feedback through a transformer, Pulse amplitude modulator, Including discrete semiconductor device, Reduction or compensation of nonlinearity in modulation characteristic, Negative-feedback-circuit arrangements with or without positive feedback, Single or vestigial sideband type, semiconductor devices only, Modifications for increasing the reliability, field-effect devices, the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region, particularly claims an amplifier circuit comprising…, 30 figures depict the invention details, the assignee organization is Renesas Electronics Corporation, located in Kawasaki-Shi, Kanagawa (JP), the exemplary claims include number 1, the recorded agent's company name - McDermott Will & Emery LLP, the assignee is a foreign company or corporation, was examined by 2843 USPTO department, the examiner - Levi Gannon, the term of the grant was extended by 358 days, the grant number is 08860523 (publication number), the application number is 13/348,448 (U.S.), the inventor's last name is Odagiri, and his first name is Naoya, the grant publication date is Oct. 14, 2014, developed by Naoya Odagiri, the applicant's name is Naoya Odagiri, the drawings include the following: Pulse Width Modulation Circuit and Voltage-Feedback, Conceptual diagram illustrating configuration of an output, Timing chart illustrating operation of the output, series of operational states of transistors, claims 1-2 comprise the invention scope, the primary classification Pulse width modulator has been designated to the document.

Invention classification information

The invention is classified under Class D power amplifiers, Switching amplifiers, having triangular shape, Pulse Width Modulation, Duty cycle control, Having particular pulse-width modulation circuit, Pulse width modulator, Duration or width modulation, Including Class D amplifier, With slope or duration control, Having digital device, Adjustment of width or dutycycle of pulses. The designated search classifications include Utilizing pulse-width modulation, Adjustment of width or dutycycle of pulses, Having particular pulse-width modulation circuit, Class D power amplifiers, Switching amplifiers, Including Class D amplifier, Pulse Width Modulation, having triangular shape, Utilizing pulse-width modulation, By pulse modulation technique, Including notching, Duration or width modulation.

Patent details
Publication number 08860523
Publication date Oct. 14, 2014
Kind code B2
Application number 13/348,448
Application date Jan. 11, 2012
Application type U
Application series code 13
Extension term 358
National classification 332/109
Total number of claims 2
Exemplary claims 1
Number of drawings 20
Number of figures 30
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