I/Q Coupling Correction Circuit for Transceiver Dynamic Range
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Solution Overview
Problem
Modern transceivers face reduced dynamic range due to coupling between components and communication lines, leading to issues like crosstalk and multiplicative jitter, which existing technologies have not effectively addressed.
Innovation Solution
A transceiver system incorporating a coupling correction circuit coupled to a clock generator and an analog-to-digital circuit (ADC), which provides in-phase and quadrature-phase corrections to adjust the sampling clock frequency, using digital-to-analog converters (DACs) to generate correction signals and perform automatic calibration to mitigate crosstalk and jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coupling correction is not applied, then device complexity remains low, but dynamic range is reduced due to crosstalk and jitter
Solution Approach 1:
The patent introduces a coupling correction circuit as an intermediary component between the clock generator and ADC. This circuit includes I-phase and Q-phase correction paths with adjustable gain and phase control, which act as mediators to cancel out coupling effects. The correction circuit processes the clock signal to eliminate crosstalk and jitter before it affects the ADC conversion, thereby improving dynamic range without requiring fundamental redesign of the entire system.
Solution Approach 2:
The patent employs parameter adjustment mechanisms within the coupling correction circuit, specifically gain control and phase control parameters. By dynamically adjusting these parameters, the system can optimize the correction strength to match the actual coupling conditions. This allows the system to adapt to varying coupling levels and maintain high dynamic range performance while avoiding excessive complexity through controlled parameter tuning rather than fixed complex architecture.
2Measurement precision
If in-phase and quadrature-phase correction circuits are added, then crosstalk and jitter are reduced, but device complexity increases
Solution Approach 1:
The patent segments the coupling correction function into two independent but coordinated paths: the I-phase correction path and the Q-phase correction path. Each path handles specific aspects of the coupling correction independently, with its own gain and phase control mechanisms. This segmentation allows for modular design and independent optimization of each correction path, improving measurement precision through targeted correction while managing overall device complexity through functional decomposition.
Solution Approach 2:
The coupling correction circuit is designed to serve multiple functions simultaneously: it corrects I-phase coupling errors, corrects Q-phase coupling errors, and provides adaptive gain and phase control. By integrating these multiple correction functions into a single unified circuit block, the patent achieves high data transmission accuracy through comprehensive correction while avoiding the complexity increase that would result from separate independent correction circuits for each function.
Data Source
AI summary
A transceiver system includes a clock generator and an analog-to-digital circuit (ADC). The transceiver system also includes a coupling correction circuit coupled to the clock generator and to the ADC, wherein the coupling correction circuit is configured to provide an in-phase correction and a quadrature-phase correction to a signal received by the ADC.