Dual-Rail Digital Audio Amplifier for Gain-Noise Switching
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Solution Overview
Problem
Class D amplifiers have a fixed gain and noise level due to a single power rail voltage source, unable to switch between high-gain and low-noise scenarios effectively.
Innovation Solution
A digital audio amplifier design with a dual voltage source system, allowing the audio amplification section to operate with different voltage sources for varying gain levels, using field effect transistors and adaptive adjustment sections to switch between high and low gain modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single power rail voltage source is used in the class D amplifier, then the device complexity is reduced, but the adaptability to different gain and noise scenarios is limited
Solution Approach 1:
The patent implements dynamic switching between different voltage sources (first voltage source and second voltage source) based on operational requirements. The audio amplification section can dynamically select which voltage source to use, enabling adaptation to different gain and noise scenarios without requiring separate amplifier circuits for each scenario.
Solution Approach 2:
The single audio amplification section is designed to perform multiple functions by accepting different voltage sources. It can operate in high-gain mode using the first voltage source and in low-noise mode using the second voltage source, making one component serve multiple purposes that would traditionally require separate dedicated circuits.
2Power
If a high voltage source is provided to the audio amplification section, then the gain is increased, but the noise level increases
Solution Approach 1:
The patent changes the voltage parameter provided to the audio amplification section based on operational requirements. By switching between a first voltage source (providing higher voltage for high gain) and a second voltage source (providing lower voltage for low noise), the system dynamically adjusts the voltage parameter to optimize the trade-off between gain and noise levels.
3Object-generated harmful factors
If a low voltage source is provided to the audio amplification section, then the noise is reduced, but the gain is decreased
Solution Approach 1:
The patent changes the voltage parameter provided to the audio amplification section based on operational requirements. By switching between a first voltage source (providing higher voltage for high gain) and a second voltage source (providing lower voltage for low noise), the system dynamically adjusts the voltage parameter to optimize the trade-off between gain and noise levels.
Data Source
AI summary
The present disclosure provides a digital audio amplifier, a chip, and an electronic device. The amplifier includes: a digital-to-analog conversion section configured to convert an inputted pulse width modulation signal into an analog signal, the pulse width modulation signal is obtained from modulation of a to-be-amplified digital audio signal; a drive section configured to amplify the analog signal and then output a drive signal; and an audio amplification section configured to amplify the drive signal into a first amplified signal at a first amplification factor when a voltage is provided by a first voltage source; and amplify the drive signal into a second amplified signal at a second amplification factor when a voltage is provided by a second voltage source; wherein the voltage of the first voltage source is lower than the voltage of the second voltage source, and the first amplification factor is smaller than the second amplification factor.