Current-Controlled Oscillator for Faster Clock Data Recovery
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Solution Overview
Problem
In high-speed serial data communication systems, existing clock and data recovery devices face challenges in immediately reflecting changes in input data due to the large RC time constant of metal routing, leading to delayed frequency variations in current-controlled oscillators, which affects the accuracy of clock and data recovery.
Innovation Solution
The implementation of a current-controlled oscillator with a variable capacitor and a regulator that supplies different currents based on control signals, allowing for immediate reflection of phase changes and frequency adjustments, either through current control or using a variable capacitor, to enhance data tracking and operating frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a current-controlled oscillator is used in clock and data recovery, then frequency control capability is improved, but the large RC time constant of metal routing causes delayed response to input data changes
Solution Approach 1:
The current source is segmented into multiple parallel current sources, each connected to the oscillator through separate metal routing paths. This segmentation reduces the effective RC time constant by distributing the total current across multiple smaller parallel paths, enabling faster response to input data changes while maintaining the required frequency control capability.
2Productivity
If the operating frequency of the oscillator is increased, then data recovery speed is improved, but power consumption increases
Solution Approach 1:
The oscillator operates at a dynamically adjustable frequency optimized for each communication channel. The system selectively adjusts the operating frequency based on channel characteristics and requirements, allowing high-speed operation when needed while reducing power consumption during normal operation. This dynamic frequency adjustment enables the system to achieve high data recovery speeds without continuously consuming maximum power.
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 solution enables the clock and data recovery device to respond promptly to input data changes, improving tracking characteristics and increasing the operating frequency of the oscillator while minimizing power consumption and circuit complexity.
Implementation Method 1
a variable capacitor configured to selectively adjust a frequency of the oscillator when the oscillator is operated at a frequency higher than a set frequency
Implementation Method 2
a regulator configured to supply current to the oscillator, and to selectively adjust the frequency of the oscillator by adjusting the current supplied to the oscillator
Data Source
AI summary
A clock and data recovery device associated with a data receiving apparatus, the clock and data recovery device including an oscillator configured to generate a clock signal; and a regulator configured to supply current to the oscillator, the regulator including, a first current source configured to supply a first current to the oscillator, and a second current source configured to supply a second current to the oscillator such that the second current is supplied to the oscillator, after a period of time, to de-emphasize the first current, the period of time being based on the first current.