Multiphase Injection-Locked Phase Rotator for Low-Power Clock Control
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Solution Overview
Problem
High-speed data transceivers face challenges in power-efficient phase control with high linearity as bit period decreases and data rates increase, requiring precise phase adjustment with minimal power consumption.
Innovation Solution
The solution involves generating a differential clock signal and using a multiphase generator to produce quadrature signals, which are then processed by an injection-locked phase rotator to achieve phase-adjusted multiphase clock signals, enabling precise phase control with a high resolution and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital phase control is achieved by interpolating the phase of quadrature signals with weights set by current digital-to-analog converters, then phase control resolution can be improved, but power consumption increases
Solution Approach 1:
The patent replaces the conventional digital-to-analog converter-based phase control mechanism with an injection-locked phase rotator that uses quadrature signals directly to control oscillator phase. This substitution eliminates the power-hungry DAC and interpolation logic while achieving fine phase resolution through the natural quadrature relationship between signals.
Solution Approach 2:
The injection-locked phase rotator uses the quadrature signals themselves to self-adjust and lock onto the correct phase relationship. The system automatically maintains precise phase alignment through injection locking without requiring external power-intensive control circuitry, allowing the signals to serve their own phase control function.
2Speed
If the bit period decreases and data rates increase, then speed is improved, but phase control linearity and precision requirements become more stringent
Solution Approach 1:
The injection-locked phase rotator provides dynamic phase adjustment capability that adapts to high-speed operation. The locking mechanism naturally maintains linearity across varying data rates by continuously tracking the quadrature signal relationships, enabling precise phase control even as bit periods decrease and data rates increase to 112 Gb/s and beyond.
3Measurement precision
If multiple phase rotators are used for clock generation and synchronization, then phase alignment accuracy is improved, but power consumption increases
Solution Approach 1:
The injection-locked phase rotator performs multiple functions simultaneously: it generates the required phase-shifted clock signals, maintains synchronization with incoming data, and provides phase alignment all through a single integrated circuit. This multi-functionality eliminates the need for separate phase rotators while achieving the same phase alignment accuracy through the injection locking mechanism.
Data Source
AI summary
Presented herein are methodologies for generating clock signals for transceivers that rely on frequency and phase error correction functions. The methodology includes generating a differential clock signal at a fundamental frequency, generating, based on the differential clock signal and using a multiphase generator, four quadrature signals at the fundamental frequency, supplying the four quadrature signals to an injection-locked phase rotator, and outputting, from the injection-locked phase rotator, a phase adjusted multiphase clock signal based on the four quadrature signals.