Class D Amplifier Carrier Phase Shifting for AD-BD Mode Switching
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Solution Overview
Problem
Class D amplifiers face challenges in dynamically adjusting their operating mode between Class AD and Class BD modes to optimize power efficiency and linearity based on input signal characteristics, leading to inefficiencies in power supply rejection ratio and electromagnetic interference.
Innovation Solution
A Class D amplifier circuitry that includes an input for receiving an input signal, first and second output nodes, driver stages, and control circuitry with a carrier wave generator that adjusts the phase shift between carrier waves based on a mode control signal, allowing dynamic switching between Class AD and Class BD modes in response to signal parameters like instantaneous level or envelope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Class D amplifier operates in Class AD mode, then linearity is improved, but power efficiency deteriorates
Solution Approach 1:
The amplifier dynamically switches between Class AD and Class BD operating modes based on the instantaneous signal level. The control circuitry adjusts the phase shift between carrier waves to transition between modes, allowing the system to adapt its characteristics in real-time rather than being fixed in one mode.
Solution Approach 2:
The invention changes the operating parameters by adjusting the phase shift between first and second carrier waves. By varying this phase shift parameter, the amplifier transitions between Class AD and Class BD modes, effectively changing its operational characteristics to optimize performance for different signal conditions.
2Use of energy by moving object
If the Class D amplifier operates in Class BD mode, then power efficiency is improved, but power supply rejection ratio deteriorates
Solution Approach 1:
The amplifier dynamically switches between Class AD and Class BD operating modes based on the instantaneous signal level. The control circuitry adjusts the phase shift between carrier waves to transition between modes, allowing the system to adapt its characteristics in real-time rather than being fixed in one mode.
Solution Approach 2:
The invention changes the operating parameters by adjusting the phase shift between first and second carrier waves. By varying this phase shift parameter, the amplifier transitions between Class AD and Class BD modes, effectively changing its operational characteristics to optimize performance for different signal conditions.
3Reliability
If the Class D amplifier operates in Class AD mode, then power supply rejection ratio is improved, but electromagnetic interference deteriorates
Solution Approach 1:
The amplifier dynamically switches between Class AD and Class BD operating modes based on the instantaneous signal level. The control circuitry adjusts the phase shift between carrier waves to transition between modes, allowing the system to adapt its characteristics in real-time rather than being fixed in one mode.
Solution Approach 2:
The invention changes the operating parameters by adjusting the phase shift between first and second carrier waves. By varying this phase shift parameter, the amplifier transitions between Class AD and Class BD modes, effectively changing its operational characteristics to optimize performance for different signal conditions.
4Object-generated harmful factors
If the Class D amplifier operates in Class BD mode, then electromagnetic interference is reduced, but linearity deteriorates
Solution Approach 1:
The amplifier dynamically switches between Class AD and Class BD operating modes based on the instantaneous signal level. The control circuitry adjusts the phase shift between carrier waves to transition between modes, allowing the system to adapt its characteristics in real-time rather than being fixed in one mode.
Solution Approach 2:
The invention changes the operating parameters by adjusting the phase shift between first and second carrier waves. By varying this phase shift parameter, the amplifier transitions between Class AD and Class BD modes, effectively changing its operational characteristics to optimize performance for different signal conditions.
Data Source
AI summary
The present disclosure relates to Class D amplifier circuitry comprising: an input for receiving an input signal; first and second output nodes for driving a load connected between the first and second output nodes. A first driver stage is provided for switching the first node between a first supply rail and a second supply rail, and a second driver stage is provided for switching the second node between the first supply rail and the second supply rail. The Class D amplifier circuitry also includes first driver control circuitry configured to receive a first carrier wave and control the switching of the first driver stage based in part on the first carrier wave; second driver control circuitry configured to receive a second carrier wave and control the switching of the second driver stage based in part on the second carrier wave; and a carrier wave generator configured to provide the first carrier wave and the second carrier wave. A phase shift between the first carrier wave and the second carrier wave is adjustable responsive to a mode control signal.