Audio Amplifier
AssigneeHarman International Industries, Incorporated
InventorEbing SHEN
Life of this patent
Estimating the term…
Abstract
The present disclosure provides an audio amplifier circuit, including: a modulator circuit configured to modulate an audio input signal into a pulse width modulation (PWM) signal; a switch stage circuit configured to receive the PWM signal and amplify the PWM signal; a demodulator circuit configured to receive and demodulate the amplified PWM signal to obtain a demodulated audio signal, and to output the demodulated audio signal to a speaker; and a feedback circuit configured to feed back the demodulated audio signal output by the demodulator circuit, and to output a feedback signal to an input end of the modulator circuit. Here, the feedback circuit includes an analog-to-digital converter and a loop filter. The switch stage circuit includes a driver and two gallium nitride (GaN) field effect transistors (FETs).
Claims20
An audio amplifier circuit, comprising:
- a modulator circuit configured to modulate an audio input signal into a pulse width modulation (PWM) signal;
- a switch stage circuit configured to receive the PWM signal and to amplify the PWM signal;
- a demodulator circuit configured to receive and demodulate the amplified PWM signal to obtain a demodulated audio signal, and to output the demodulated audio signal to a speaker;
- and
- a feedback circuit configured to feed back the demodulated audio signal output by the demodulator circuit, and to output a feedback signal to an input end of the modulator circuit.
An audio amplifier circuit, comprising:
- a modulator circuit configured to modulate an audio input signal into a first signal;
- a switch stage circuit configured to receive the first signal and to amplify the first signal;
- a demodulator circuit configured to receive and demodulate the amplified first signal to obtain a demodulated audio signal, and to output the demodulated audio signal to a speaker;
- and
- a feedback circuit configured to feed back the demodulated audio signal output by the demodulator circuit, and to output a feedback signal to an input end of the modulator circuit.
Dependencies are inferred from the claim text.