Back to results
US 2009/0153243 A1Published application
Class d amplifier
AssigneePanasonic Corporation
InventorAkihito Tsukamoto
Life of this patent
Estimating the term…
Abstract
A single-end-output class D amplifier is provided that handles a load such as stereo headphones without using an expensive part such as a crystal resonator or transformer. Class D amplifier 200 is equipped with PWM circuits 221 and 222 that perform PWM modulation of an input signal and output two opposite-phase PWM outputs, PWM output buffers 251 through 254 that amplify differential outputs of PWM circuits 221 and 222 respectively using power supply voltage VDD, and inductors 261 through 264 that combine PWM outputs amplified by PWM output buffers 251 through 254.
Claims4
A class D amplifier comprising:
- a PWM circuit that performs PWM modulation of an input signal and outputs two opposite-phase PWM outputs;
- a plurality of buffers that amplify the two PWM outputs respectively using power supply voltage VDD;
- and
- a plurality of inductors that combine PWM outputs amplified by the plurality of buffers.
1 more element
Dependencies are inferred from the claim text.