Input Matching Circuit for Distortion-Free Delta-Sigma PA Drive
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Solution Overview
Problem
Conventional Class-S amplification systems face challenges in delivering delta-sigma modulated signals with high Peak to Average Power Ratio (PAPR) to power amplifiers without distortion, leading to efficiency deterioration due to nonlinear components and broadband signal handling difficulties.
Innovation Solution
The implementation of a phase compensation circuit and input matching circuit to apply specific phase delays to delta-sigma modulated signals, ensuring delivery to power amplifiers without distortion and enhancing broadband matching, thereby preventing aliasing effects and maintaining constant envelope signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional Class-S amplification system uses a delta-sigma modulator to convert RF signal into RF pulse signal, then the power amplifier can operate in switching mode with theoretical 100% efficiency, but the broadband signal handling becomes difficult and distortion occurs due to high PAPR and nonlinear components
Solution Approach 1:
The patent applies preliminary action by inserting a phase compensation circuit before the power amplifier to pre-correct the phase characteristics of the delta-sigma modulated signal. This preliminary phase adjustment ensures that the signal arrives at the power amplifier with optimized phase characteristics, preventing distortion while maintaining the switching mode operation and high efficiency.
Solution Approach 2:
The patent introduces an intermediary phase compensation circuit between the delta-sigma modulator and the power amplifier. This intermediary component mediates the signal transition by compensating for phase delays and broadband signal handling issues, allowing the power amplifier to operate efficiently without introducing distortion from high PAPR and nonlinear components.
2Loss of energy
If the power amplifier operates in switching mode to achieve high efficiency, then energy loss is minimized, but broadband signal handling becomes difficult and distortion occurs
Solution Approach 1:
The phase compensation circuit performs preliminary action by pre-adjusting the phase characteristics of the broadband delta-sigma modulated signal before it enters the switching mode power amplifier. This preliminary phase optimization enables the power amplifier to handle broadband signals effectively while maintaining switching mode operation and high efficiency.
Solution Approach 2:
The patent applies parameter changes by modifying the phase characteristics of the signal through the phase compensation circuit. By changing the phase parameter of the broadband signal before amplification, the system enables the power amplifier to handle broadband signals with high efficiency without distortion from switching mode operation.
3Device complexity
If delta-sigma modulated signals with high PAPR are delivered directly to the power amplifier, then the system structure remains simple, but distortion occurs due to nonlinear components
Solution Approach 1:
The patent introduces an intermediary phase compensation circuit between the delta-sigma modulator and the power amplifier. This relatively simple intermediary component corrects phase delays and prevents distortion caused by nonlinear components, maintaining signal integrity without significantly increasing system complexity.
Solution Approach 2:
The patent replaces complex signal processing mechanisms with a phase compensation circuit that uses phase delay adjustment to prevent distortion. Instead of using complex linearization techniques or reducing PAPR through additional modulation stages, the system substitutes a simpler phase adjustment mechanism to achieve the same distortion prevention goal.
Data Source
AI summary
An apparatus and method amplifies a delta-sigma modulated signal and delivers the amplified signal to a power amplifier without distortion in a communication system. The apparatus receives a delta-sigma modulated signal, phase-delays the received delta-sigma modulated signal by a multiple of 360° for a bandwidth of the delta-sigma modulated basic signal, and amplifies the phase-delayed signal, facilitating implementation of a high-efficiency delta-sigma modulation-based amplification system.