Pulse width modulation amplifier, related chip and signal width modulation method

A pulse width modulation and amplifier technology, applied in the direction of pulse duration/width modulation, power amplifiers, improved amplifiers to reduce noise impact, etc., can solve the problems of pulse width modulation amplifier signal quality degradation, intermodulation distortion, etc., to achieve The effect of improving signal quality and reducing low-frequency noise

Active Publication Date: 2021-08-24
汇顶科技私人有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, when the output signal is used as a negative feedback signal, the signal with the carrier component will be subjected to the pulse width modulation operation again, thereby causing intermodulation distortion (inter modulation distortion), resulting in pulse width modulation The signal quality of the amplifier is degraded

Method used

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  • Pulse width modulation amplifier, related chip and signal width modulation method
  • Pulse width modulation amplifier, related chip and signal width modulation method
  • Pulse width modulation amplifier, related chip and signal width modulation method

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Embodiment Construction

[0015] The following disclosure provides various implementations or illustrations, which can be used to achieve different features of the disclosure. Specific examples of components and arrangements are described below to simplify the present disclosure. It will be appreciated that these descriptions are merely examples and are not intended to limit the disclosure. For example, in the description below, forming a first feature on or over a second feature may include some embodiments wherein the first and second features are in direct contact with each other; and may also include In some embodiments, additional components are formed between the first and second features, such that the first and second features may not be in direct contact. In addition, this disclosure may reuse reference symbols and / or labels in various embodiments. Such repetition is for the sake of brevity and clarity, and does not in itself represent a relationship between the different embodiments and / or ...

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Abstract

The invention discloses a pulse width modulation amplifier, a related chip and a signal width modulation method. The pulse width modulation amplifier converts a digital input signal into an analog input signal, subtracts a feedback signal from the analog input signal to generate an analog error signal, converts the analog error signal into a digital error signal, filters the digital error signal, and downsamples the digital error signal to generate an error reference signal. The pulse width modulation amplifier adds a digital input signal and an error reference signal to generate an input correction signal, and compares the input correction signal and an inverted input correction signal with a triangular wave signal to generate a first modulation signal and a second modulation signal. The driving capabilities of the first modulation signal and the second modulation signal are improved to generate a first modulation output signal and a second modulation output signal, and the difference between the first modulation output signal and the second modulation signal is used as a pulse width modulation signal.

Description

technical field [0001] The present application relates to a pulse width modulation amplifier, in particular to a pulse width modulation amplifier capable of reducing intermodulation distortion. Background technique [0002] The pulse width modulation (Pulse Width Modulation) amplifier is a power amplifier with high power efficiency. Since the output of the pulse width modulation amplifier is a square wave signal, the output stage (Power Stage) circuit of the pulse width modulation amplifier will only work In both on and off states. In this case, there is almost no other energy loss except the switching loss (Switching Loss) caused by the transistor in the state switching and the turn-on loss (Turn On Loss) caused by the transistor in the on state, so the efficiency It can reach more than 90%, also known as Class D (Class D) amplifier. [0003] Generally speaking, the output stage circuit of the amplifier operates according to the operating voltage supplied by the system, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/21H03F1/32H03F1/26H03K7/08
CPCH03F3/21H03F1/32H03F1/26H03K7/08
Inventor 王文祺
Owner 汇顶科技私人有限公司
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