Low Distortion Switching Amplifier Circuits and Methods
AssigneePacific Tech Microelectronics, Inc.
InventorsWolf Zhang, Hideto Takagishi, Alan Wu
Life of this patent
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Abstract
Embodiments of the present invention include switching amplifier circuits and methods. In one embodiment, the present invention includes an low distortion method of driving a switching amplifier comprising generating a first pulse width modulated signal on a first terminal, generating a second pulse width modulated signal on a second terminal, and delaying one of the first or second signals. In one embodiment, the modulated signals and delay result in pulse trains near zero crossings to reduce crossover distortion.
Claims20
A method of performing switching amplification, the method comprising:
- receiving an analog input signal;
- generating a first pulse width modulated signal;
- and
- generating a second pulse width modulated signal,
- wherein if the magnitude of the analog input signal is above a threshold, the first pulse width modulated signal is constant when the second pulse width modulated signal is switching and the second pulse width modulated signal is constant when the first pulse width modulated signal is switching,
- wherein the first and second pulse width modulated signals converge to a first pulse width when the magnitude of the input signal decreases below the threshold.
A method for performing switching amplification in an amplifier, the method comprising:
- receiving an analog input signal;
- generating a first pulse width modulated signal;
- generating a second pulse width modulated signal;
- delaying the first pulse width modulated signal to generate a delayed pulse width modulated signal;
- coupling the delayed pulse width modulated signal to a first output terminal of the amplifier;
- and
- coupling the second pulse width modulated signal to a second output terminal of the amplifier.
A switching amplifier comprising:
- a first modulation circuit coupled to receive a first input signal, the first modulation circuit generating a first pulse width modulated signal;
- a second modulation circuit coupled to receive a second input signal, the second modulation circuit generating a second pulse width modulated signal;
- a digital circuit coupled to receive the first pulse width modulated signal and the second pulse width modulated, the digital circuit generating a third pulse width modulated signal and generating a fourth pulse width modulated signal,
- wherein the first and second input signals form an analog input,
- wherein the third pulse width modulated signal and the fourth pulse width modulated signal converge to a first pulse width as the magnitude of the analog input signal decreases.
Dependencies are inferred from the claim text.