Power Amplifier Nulling Monitor for Distortion Feedback Isolation
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Solution Overview
Problem
In wired communication networks, existing methods for echo cancellation in full duplex systems face challenges due to the need for high-performance analog-to-digital converters (ADCs) to distinguish between desired fundamental signals and distortion signals, leading to increased power consumption and reduced headroom.
Innovation Solution
A power amplifier circuit with a distortion monitoring circuit that generates a distortion feedback signal from the intended output, allowing for echo cancellation without affecting the output power capability, using techniques such as partial and full output monitoring approaches with virtual ground structures and directional couplers to isolate distortion signals from fundamental signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-performance ADCs are used to distinguish between fundamental signals and distortion signals for echo cancellation, then measurement precision is improved, but power consumption increases and headroom is reduced
Solution Approach 1:
The patent segments the output signal monitoring function into two separate paths: one path extracts the fundamental signal for echo cancellation, and another path extracts the distortion signal for distortion compensation. This segmentation allows each path to use optimized ADCs with appropriate precision requirements, reducing overall power consumption while maintaining measurement precision for both signal types.
Solution Approach 2:
The patent extracts the distortion signal from the total output signal using distortion extraction circuitry that separates distortion components from the fundamental signal. This extraction enables the system to process distortion and fundamental signals independently through separate ADCs, allowing the use of lower-power ADCs for distortion monitoring while maintaining precision for echo cancellation.
2Measurement precision
If high-performance ADCs are used to monitor both fundamental and distortion signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the distortion monitoring function with the existing echo cancellation framework by integrating distortion extraction circuitry into the output monitoring path. This unified approach allows both fundamental and distortion signals to be processed through a coordinated system with shared control logic, reducing overall device complexity compared to completely separate monitoring systems.
Solution Approach 2:
The patent introduces an intermediary distortion extraction circuit that acts as a mediator between the power amplifier output and the ADCs. This intermediary component separates and conditions the distortion and fundamental signals before they reach the ADCs, simplifying the overall system architecture by providing clean, separated signal paths that reduce the complexity of signal processing requirements.
3Object-generated harmful factors
If distortion monitoring is implemented, then distortion in output signal is reduced, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the extracted distortion signal is fed back to the power amplifier control circuitry to dynamically adjust and reduce distortion in real-time. This feedback approach enables continuous distortion compensation without requiring complex open-loop correction circuits, maintaining simplicity while effectively reducing harmful distortion.
Solution Approach 2:
The patent replaces complex mechanical or analog distortion correction mechanisms with electronic signal processing approaches. By using electronic extraction and digital or analog processing of the distortion signal, the system achieves distortion reduction through circuit-based methods that are more integrated and less mechanically complex than traditional correction systems.
Data Source
AI summary
Techniques for monitoring a distortion signal of a power amplifier circuit, where the output of a distortion monitoring circuit includes little or no fundamental signal and closely represents the actual distortion of the amplifier circuit of a wired communications system. The power amplifier circuit can generate a distortion feedback signal that does not affect the power amplifier's output power capability, e.g., no inherent loss in the fundamental output of the amplifier. That is, using a distortion monitor circuit, the power amplifier circuit can resolve a distortion feedback signal from the intended output signal of the output power amplifier circuit.