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).
Claims16
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,
- wherein the switch stage circuit comprises a driver and a first Gallium Nitride (GaN) field effect transistor (FET) and a second GaN FET, wherein a first output end of the driver is connected to a gate of the first GaN FET, and a second output end of the driver is connected to a gate of the second GaN FET,
- wherein the first output end of the driver is connected to one end of a first resistor and a second resistor connected in parallel;
- the other end of the first resistor and the second resistor connected in parallel is connected to one end of a first magnetic bead;
- and the other end of the first magnetic bead is connected to the gate of the first GaN FET.
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,
- wherein the switch stage circuit comprises a driver and a first Gallium Nitride (GaN) field effect transistor (FET) and a second GaN FET, wherein a first output end of the driver is connected to a gate of the first GaN FET, and a second output end of the driver is connected to a gate of the second GaN FET,
- wherein the first output end of the driver is connected to one end of a first resistor and a second resistor connected in parallel;
- the other end of the first resistor and the second resistor connected in parallel is connected to one end of a first magnetic bead;
- and the other end of the first magnetic bead is connected to the gate of the first GaN FET.
Dependencies are inferred from the claim text.