Multiplexing Transmitter Clock Correction for Duty Cycle Errors
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Solution Overview
Problem
Conventional multiplexers and transmitters face challenges with high-speed clock generation and distribution due to increased duty cycle and quadrature errors, which hinder the achievement of higher data transfer speeds in carrier networks and data centers.
Innovation Solution
A system comprising an error detector circuit and correction circuits to measure and adjust duty cycle and quadrature errors in multiplexing transmitters, using a CMOS quarter-rate multiplexing transmitter with duty cycle and quadrature error correction mechanisms to improve operational speeds and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If operational speeds of transmitters are increased to meet higher data rates, then data transfer speed is improved, but duty cycle error and quadrature error increase
Solution Approach 1:
The patent applies preliminary action by measuring duty cycle error and quadrature error before they significantly impact transmitter performance, then pre-compensating for these errors. The error detector circuit continuously monitors clock signals and generates correction values that are applied in advance to adjust the multiplexer operation, preventing error accumulation at high speeds.
Solution Approach 2:
The patent implements feedback by using the error detector circuit to continuously monitor duty cycle and quadrature errors in the clock signals, then feeding this information back to adjust the multiplexer timing. The correction circuit modifies the multiplexer operation based on the measured errors, creating a closed-loop system that maintains precision despite increased operational speeds.
2Speed
If operational speeds of transmitters are increased to meet higher data rates, then data transfer speed is improved, but quadrature error increases
Solution Approach 1:
The patent measures quadrature error between clock phases before it degrades signal integrity, then applies preliminary correction to the multiplexer timing. The error detector identifies quadrature mismatches in advance, and the correction circuit adjusts the timing relationships between clock phases to prevent error propagation at high data rates.
Solution Approach 2:
The patent uses feedback by continuously monitoring quadrature error between clock signals and using this information to dynamically adjust the multiplexer operation. The error detector provides real-time measurements of phase relationships, and the correction circuit applies compensatory timing adjustments to maintain precise quadrature relationships despite high-speed operation.
3Productivity
If conventional multiplexers are used at high frequencies, then data transfer capability is improved, but implementation challenges and power consumption increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the timing parameters of the multiplexer based on measured duty cycle and quadrature errors. Rather than using a fixed high-frequency design that consumes excessive power, the system modifies operational parameters in real-time to optimize the balance between data transfer capability and power consumption, allowing efficient operation at required data rates.
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.