Injection-Locked Clock Multiplier Using Phase-Switched Injection
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Solution Overview
Problem
Existing fractional clock multiplication techniques, such as those based on phase-locked loops (PLL) and delay-locked loops (DLL), are slow in switching clock frequencies, often taking more than 10 ns, which is inefficient for applications requiring rapid frequency changes.
Innovation Solution
The use of an injection-locked oscillator (ILO) with periodically changed injection locations or phases of the injection signal allows for faster fractional clock multiplication, enabling frequency switching in less than or equal to 10 ns by modifying the injection location or phase within the ILO loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional phase-locked loop or delay-locked loop techniques are used for fractional clock multiplication, then the circuit can achieve frequency multiplication, but the switching speed between different clock frequencies is slow (more than 10 ns)
Solution Approach 1:
The patent changes the operating parameters of the oscillator by periodically modifying the injection location or phase of the injection signal, enabling rapid frequency switching without the slow settling time characteristic of traditional PLL or DLL approaches
Solution Approach 2:
The injection signal is applied periodically with specific timing and phase relationships to achieve frequency multiplication while maintaining fast switching capability between different clock frequencies
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 enables rapid and precise switching of clock frequencies, achieving constant and desired frequency and phase output signals, outperforming traditional methods in speed and efficiency.
Implementation Method 1
an injection signal is injected into an injection-locked oscillator. The injection signal has a frequency that is a fractional multiple of a desired output frequency
Data Source
AI summary
Circuitry capable of performing fractional clock multiplication by using an injection-locked oscillator is described. Some embodiments described herein perform fractional clock multiplication by periodically changing the injection location, from a set of injection locations, where the injection signal is injected and/or by periodically changing a phase, from a set of phases, of the injection signal that is injected into the ILO.