Transceiver Front-End Distortion Cancellation for Higher Throughput
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Solution Overview
Problem
As signal throughput increases in communication systems, distortion becomes a significant limit to performance, leading to increased bit-error-rates and limitations in approaching Shannon channel limits, particularly in applications like video transmission and multi-carrier/multi-modulation signal transmission.
Innovation Solution
The implementation of transceiver circuitry with distortion correction circuitry that determines and applies a distortion cancellation function, either through digital inversion or polynomial representation, to cancel distortion components from conditioned signals in both analog and digital front ends, using matrix operators, look-up tables, and successive-approximation-register ADCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal throughput is increased to meet bandwidth demand, then data transmission capacity is improved, but distortion increases leading to higher bit-error-rates
Solution Approach 1:
The patent measures the distortion introduced by the front-end circuitry and uses this measured distortion to generate a cancellation function. This cancellation function is then applied to remove the distortion from the signal, effectively converting the harmful distortion into a beneficial correction mechanism that enables higher throughput with maintained reliability
2Reliability
If distortion correction circuitry is added to cancel distortion components, then signal quality is improved, but device complexity increases
Solution Approach 1:
The system performs self-correction by measuring its own distortion characteristics through the distortion measurement circuitry and generating its own cancellation function. The distortion correction circuitry uses this self-generated information to compensate for its own distortions, eliminating the need for external calibration equipment or complex manual adjustment mechanisms
Data Source
AI summary
Transceiver circuitry in an integrated circuit device includes a receive path including an analog front end for receiving analog signals from an analog transmission path and conditioning the analog signals, and an analog-to-digital converter configured to convert the conditioned analog signals into received digital signals for delivery to functional circuitry, and a transmit path including a digital front end configured to accept digital signals from the functional circuitry and to condition the accepted digital signals, and a digital-to-analog converter configured to convert the conditioned digital signals into analog signals for transmission onto the analog transmission path. At least one of the analog front end and the digital front end introduces distortion and outputs a distorted conditioned signal. The transceiver circuitry further includes distortion correction circuitry at the one of the analog front end and the digital front end, to determine and apply a distortion cancellation function to the distorted signal.