Digital Amplifier PWM Synchronization for Delay and Noise Compensation
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Solution Overview
Problem
Digital amplifiers using pulse-width-modulation (PWM) signals face distortion due to time delay and power noise, which existing solutions fail to effectively compensate for across varying IC fabrication and temperature conditions.
Innovation Solution
A digital amplifier design that includes triggers for generating level signals based on control voltages, a pulse generator, and a control unit to produce a modified pulse-width-modulation (MPWM) signal, utilizing a delay circuit and calculating unit to synchronize the signal and adjust control voltages to minimize distortion and power noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a PWM signal is used to drive a class D power amplifier, then power efficiency is improved, but signal distortion occurs due to time delay and power noise
Solution Approach 1:
The patent implements a feedback mechanism where the control unit monitors the digital output signal and adjusts the control voltages accordingly. The calculating unit computes the required control voltages based on the relationship between the PWM signal and the generated MPWM signal, creating a closed-loop system that compensates for time delay and power noise effects while maintaining power efficiency.
Solution Approach 2:
The patent changes the parameters of the PWM signal by generating a modified PWM signal (MPWM) with adjusted pulse width and timing characteristics. The control unit dynamically adjusts the control voltages to modify the pulse width modulation parameters, compensating for time delay and power noise while preserving the power efficiency benefits of PWM-driven class D amplifiers.
2Reliability
If delay time is increased to compensate for time delay, then signal compensation is improved, but output signal accuracy deteriorates
Solution Approach 1:
The patent employs dynamic adjustment of the control voltages based on real-time signal conditions. The calculating unit continuously computes optimal control voltages that adapt to varying time delay conditions, allowing the system to dynamically compensate for delay without introducing fixed timing errors that would degrade output signal accuracy.
Solution Approach 2:
The system performs preliminary calculation of the control voltages before generating the MPWM signal. The control unit pre-computes the appropriate voltage levels based on the expected time delay characteristics, allowing the system to proactively compensate for delay effects while maintaining precise output signal control.
3Adaptability or versatility
If IC fabrication and temperature conditions vary, then manufacturing adaptability is improved, but signal stability deteriorates
Solution Approach 1:
The feedback mechanism continuously monitors the digital output signal and adjusts control voltages to compensate for variations caused by IC fabrication differences and temperature changes. This closed-loop control ensures that signal stability is maintained across different manufacturing conditions and operating temperatures.
Solution Approach 2:
The system dynamically adjusts the control voltage parameters in response to fabrication and temperature variations. The calculating unit computes modified control voltages that adapt to the specific characteristics of each IC instance and operating condition, maintaining signal stability despite manufacturing tolerances and environmental changes.
Data Source
AI summary
An apparatus includes a first trigger, a second trigger, a pulse generator, and a control unit. The first trigger generates a first trigger signal and a first level signal; the second trigger generates a second trigger signal and a second level signal; the pulse generator generates a digital output signal according to the first and the second level signals; and the control unit outputs the first and the second control voltages according to the digital input signal and the digital output signal.