Multiplexing Transmitter Clock Correction for Duty Cycle Errors
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Solution Overview
Problem
Conventional high-speed multiplexers face challenges with increased error rates due to duty cycle and quadrature errors, which hinder the achievement of higher data transfer speeds in high-frequency clock distribution circuits.
Innovation Solution
Incorporating an error detector circuit and correction circuits to measure and adjust clock duty cycle and quadrature errors in a CMOS multiplexing transmitter system, allowing for real-time compensation and reduced error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional high-speed multiplexers are used to achieve higher data rates, then operational speed increases, but error rates increase due to duty cycle and quadrature errors
Solution Approach 1:
The patent implements feedback mechanisms through error detector circuits that continuously monitor duty cycle and quadrature errors in the clock signals. The detectors generate error signals that are fed back to correction circuits, which adjust the clock signals to minimize errors. This closed-loop feedback system enables the multiplexer to maintain high operational speeds while actively compensating for and reducing error rates caused by duty cycle and quadrature deviations.
2Device complexity
If conventional multiplexing architectures are used, then device complexity is reduced, but sensitivity to clock errors increases
Solution Approach 1:
The patent introduces intermediary error detector and correction circuits that act as mediators between the clock distribution system and the multiplexer core. These intermediary components monitor clock signal quality and provide real-time corrections without fundamentally changing the multiplexer architecture. This approach maintains the simplicity of conventional multiplexing structures while adding error compensation capabilities through intermediate monitoring and adjustment stages.
3Use of energy by moving object
If conventional multiplexers are used, then power consumption is reduced, but implementation challenges in high frequency clock distribution circuits increase
Solution Approach 1:
The patent segments the error compensation function into separate, modular error detector circuits for duty cycle and quadrature errors. Each detector is implemented as an independent module that can be selectively enabled based on the specific requirements of the application. This segmentation allows the system to add error correction capabilities in a modular fashion, reducing implementation complexity while maintaining power efficiency by only activating correction functions when needed.
Data Source
AI summary
Various aspects provide for error detection and compensation for a multiplexing transmitter. For example, a system can include an error detector circuit and a duty cycle correction circuit. The error detector circuit is configured to measure duty cycle error for a clock associated with a transmitter to generate error detector output based on a clock pattern for output generated by the transmitter in response to a defined bit pattern. The duty cycle correction circuit is configured to adjust the clock associated with the transmitter based on the error detector output. Additionally or alternatively, the error detector circuit is configured to measure quadrature error between an in-phase clock and a quadrature clock in response to the defined bit pattern. Additionally or alternatively, the system can include a quadrature error correction circuit configured to adjust phase shift between the in-phase clock and the quadrature clock based on quadrature error.