Full-Duplex Transceiver Echo Cancellation with Shared DAC Switching
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Solution Overview
Problem
Full duplex communication systems face challenges with echo cancellation, leading to increased physical form factor, heat dissipation requirements, and distortion, which degrade signal-to-noise ratio and increase system complexity due to mismatched active switches in digital-to-analog converter (DAC) circuits.
Innovation Solution
The system employs a transceiver design with a shared active circuit for both transmit and replica DACs, using a replica TX signal to subtract from the combined signal at the receiver, reducing distortion and noise by matching the active circuit components, thereby minimizing residual TX signal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate active circuits are used for transmit and replica DACs to enable echo cancellation, then echo cancellation capability is improved, but device complexity and distortion increase due to mismatched active switches
Solution Approach 1:
The patent merges the active circuits of the transmit DAC and replica DAC into a single shared active circuit. This consolidation eliminates the mismatch between separate active circuits while maintaining echo cancellation capability, as the shared active circuit ensures identical switching behavior for both signal paths.
Solution Approach 2:
The shared active circuit serves multiple functions: it controls both the transmit DAC that generates the main signal and the replica DAC that generates the echo cancellation signal. This multi-functionality reduces overall device complexity while preserving the ability to cancel echoes effectively.
2Reliability
If separate active circuits are used for transmit and replica DACs, then echo cancellation is enabled, but manufacturing precision requirements increase due to active switch mismatch
Solution Approach 1:
By combining the active circuits into one shared unit, the patent eliminates the need for precise matching between separate active circuits. The single shared active circuit inherently provides identical switching characteristics for both transmit and replica DACs, removing the manufacturing precision constraint.
3Reliability
If separate active circuits are used for transmit and replica DACs, then echo cancellation functionality is achieved, but heat dissipation increases due to redundant active components
Solution Approach 1:
The patent reduces heat dissipation by merging redundant active circuits into a single shared active circuit. This consolidation eliminates duplicate active components that would otherwise generate unnecessary heat, while the shared circuit continues to provide the required echo cancellation functionality.
Data Source
AI summary
The systems and methods discussed herein utilized a wireless or wired transceiver having a transmitter and a receiver. The transceiver is configured to reduce distortion contributions associated with echo cancelling. The transmitter provides a replica signal and a transmit signal. The replica signal and the transmit signal can be provided using a common switch.