I/Q Coupling Correction in Transceivers for Jitter Reduction
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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 the signal received by the ADC, using calibration current sources and digital-to-analog converters to generate correction signals that adjust the sampling clock frequency and correct additive and multiplicative spurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coupling correction is not applied, then device complexity is low, but dynamic range is reduced due to crosstalk and multiplicative jitter
Solution Approach 1:
The coupling correction circuit applies preliminary correction to the sampling clock signal by adjusting its frequency based on measured in-phase and quadrature-phase coupling effects. This preliminary action prevents crosstalk and multiplicative jitter from degrading the dynamic range before the signal is processed further, thereby improving reliability without requiring complex real-time correction mechanisms.
Solution Approach 2:
The system measures the coupling effects between communication lines and uses this feedback information to adjust the sampling clock frequency. The coupling correction circuit continuously monitors and corrects for in-phase and quadrature-phase coupling, creating a feedback loop that maintains optimal dynamic range while managing device complexity through intelligent control rather than hardware over-engineering.
2Object-affected harmful factors
If coupling correction circuit is added, then crosstalk and multiplicative jitter are reduced, but device complexity increases
Solution Approach 1:
The coupling correction circuit reduces harmful coupling effects by changing the frequency parameter of the sampling clock signal. By adjusting the clock frequency based on measured in-phase and quadrature-phase coupling characteristics, the system effectively reduces crosstalk and multiplicative jitter without adding complex correction hardware, achieving harm reduction through intelligent parameter adjustment.
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.