Scalable I/O Link Transmitter Power Calibration
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Solution Overview
Problem
Existing methods for powering transmitters in digital links, such as differential bit links, face challenges in optimizing power efficiency and data rate capabilities, particularly in scalable I/O links where bandwidth and power consumption need to be adjusted to meet changing performance demands.
Innovation Solution
The implementation of separately controllable voltage and current supplies for transmitter driver and predriver circuits, along with a control circuit that adjusts these supplies based on bit error rate and data rate requirements, using frequency-to-voltage converters to set optimal supply levels, ensures efficient power usage and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a global Vcc supply and global CML IBias supply are used for the transmitter, then the circuit complexity is reduced and ease of manufacture is improved, but power efficiency cannot be optimized and excess power is consumed
Solution Approach 1:
The patent divides the transmitter power supply into separate controllable supplies: a first voltage supply for the driver circuit, a second voltage supply for the predriver circuit, and separate CML bias supplies. This segmentation allows independent control of power consumption in each circuit block, enabling optimization of power efficiency without requiring complete redesign of the power distribution architecture.
Solution Approach 2:
The patent implements dynamic control of power supplies through calibration circuits that adjust voltage and current levels based on operating conditions. The driver circuit voltage supply and predriver circuit voltage supply can be independently calibrated to optimal levels, allowing the system to adapt power consumption to actual performance requirements rather than using fixed global supplies.
2Productivity
If higher voltage and current supplies are provided to the transmitter, then data rate capabilities and output swing are improved, but power consumption increases
Solution Approach 1:
The patent enables independent calibration of voltage and current parameters for different transmitter circuits. The driver circuit can be supplied with optimized voltage and current levels tailored to achieve required output swing and data rate, while the predriver circuit receives separate optimized supplies. This parameter optimization ensures each circuit operates at minimum necessary power levels for its function.
Solution Approach 2:
The patent applies different voltage and current supply characteristics to different circuits based on their specific requirements. The driver circuit receives supplies optimized for high-current switching and output drive, while the predriver circuit receives supplies optimized for signal conditioning. This localized optimization allows each circuit to achieve its performance targets with minimal power consumption.
3Reliability
If the transmitter is designed for high performance with adequate output swing, then reliability is improved, but power consumption increases due to excessive bias currents
Solution Approach 1:
The patent implements calibration routines that measure actual transmitter performance (output swing, bit error rate) and use this feedback to adjust the voltage and current supplies to optimal levels. The calibration process determines the minimum supplies required to achieve adequate output swing and reliable operation, eliminating excessive bias currents that would otherwise be needed to guarantee performance without measurement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for independent control of power consumption in transmitter components, optimizing data rate and reducing bit error rates while minimizing excess power usage, thereby enhancing the efficiency and adaptability of transmitters in digital links.
Implementation Method 1
using frequency-to-voltage converters to set optimal supply levels
Data Source
AI summary
In some embodiments, provided are methods and circuits to control the power efficiency of a transceiver or a transmitter in a scalable I/O link (a link whose bandwidth and power can be adjusted to meet changing performance demands).