Wide-Frequency Phase Interpolator With Feedback Clock Calibration
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Solution Overview
Problem
High-speed serial communication links in electronic devices face challenges with power consumption and accuracy due to the need for multiple clock signals with varying frequencies and phases, leading to potential errors in data reception.
Innovation Solution
A phase interpolator circuit that includes a sampling circuit, delay circuit, comparator, and counter to capture and calibrate clock signals, generating a weighted sum of phase-shifted input signals to control the operating point and reduce power consumption while maintaining accuracy across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple clock signals with varying frequencies and phases are used in high-speed serial communication, then communication speed and functionality are improved, but power consumption increases
Solution Approach 1:
The patent combines multiple clock signal generation functions into a single phase interpolator circuit that can generate multiple phase-shifted clock signals simultaneously. By merging the functionality of multiple clock generators into one circuit, the overall power consumption is reduced while still providing the necessary multiple clock signals for high-speed serial communication.
Solution Approach 2:
The phase interpolator dynamically adjusts the phase and frequency of generated clock signals based on calibration feedback. The circuit continuously monitors output signals and adjusts its operation to maintain optimal phase relationships across varying frequencies, enabling adaptive power management while maintaining communication performance.
2Ease of operation
If multiple clock signals with varying phases are used in SERDES, then timing control capability is improved, but phase drift and errors increase
Solution Approach 1:
The patent implements a calibration circuit with feedback that continuously monitors the phase relationships of generated clock signals and adjusts the phase interpolator accordingly. This feedback mechanism detects phase drift and corrects it in real-time, maintaining accurate phase relationships across the wide frequency range while preserving timing control capability.
Solution Approach 2:
The calibration circuit performs preliminary phase alignment before normal operation begins. By pre-calibrating the phase relationships at different frequencies, the system establishes accurate phase references in advance, preventing phase drift during actual communication operations.
3Productivity
If the operating frequency of clock signals is increased, then data transmission speed is improved, but power consumption and signal integrity deteriorate
Solution Approach 1:
The phase interpolator dynamically changes its operating parameters including phase shift amounts and signal amplitudes based on the input frequency. At higher frequencies, the circuit adjusts parameters to minimize power consumption while maintaining signal integrity, rather than operating at fixed parameters that would be optimal only for a specific frequency.
4Adaptability or versatility
If the frequency range of clock signals is expanded, then adaptability to different communication standards is improved, but circuit complexity increases
Solution Approach 1:
The phase interpolator is designed as a universal circuit that can operate across a wide frequency range (200 MHz to 6.4 GHz) and support multiple communication standards. By creating a single multi-functional circuit rather than separate circuits for different frequency ranges, the patent achieves broad adaptability without proportionally increasing complexity.
Data Source
AI summary
A phase interpolator includes a sampling circuit configured to capture samples of an output of the phase interpolator, a delay circuit configured to delay sampling by the sampling circuit, a comparator configured to provide a comparison signal that indicates whether voltage of the samples exceed a reference voltage, and a counter responsive to the comparison signal and configured to provide an output that controls an operating point of the phase interpolator. The phase interpolator my further include a pair of driver circuits configured to concurrently drive the output of the phase interpolator.