Injection-Locked Ring Oscillator Phase Rotation With Feedback Control
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Solution Overview
Problem
Conventional phase rotator circuits face issues with power consumption, speed, and precision due to the use of voltage-controlled oscillators (VCOs) and digital phase shifters, while existing injection-locked phase rotator circuits are sensitive to power, voltage, and temperature variations without closed-loop frequency tracking.
Innovation Solution
An injection locked phase rotator (ILPR) circuit with a free-running injection-locked ring oscillator (ILRO) that uses a feedback loop for phase control, employing a phase detector and phase to voltage circuit to maintain high performance across variations by optimizing phase differences through a negative feedback mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage-controlled oscillators (VCOs) are used in phase rotator circuits, then phase control capability is achieved, but power consumption increases and precision deteriorates
Solution Approach 1:
The patent replaces voltage-controlled oscillators (VCOs) with an injection-locked ring oscillator system. The injection-locked phase rotator uses a ring oscillator locked by an external injection signal rather than a VCO controlled by voltage, thereby eliminating the high power consumption associated with VCO operation while maintaining phase control capability through the injection locking mechanism.
Solution Approach 2:
The patent implements a feedback mechanism using a phase detector that compares the phase of output signals and generates a control signal to adjust the injection timing. This closed-loop feedback system maintains precise phase control without requiring the continuous high power consumption of VCOs, as the injection-locked oscillator naturally maintains frequency and phase synchronization.
2Ease of operation
If digital phase shifters are used in phase rotator circuits, then phase adjustment capability is achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex digital phase shifters with an injection-locked ring oscillator system. Instead of using multiple digital switching elements and control logic to achieve phase adjustment, the system uses the natural properties of injection-locked oscillation where the phase is determined by the timing of the injection signal, greatly simplifying the circuit architecture.
Solution Approach 2:
The injection-locked ring oscillator serves multiple functions simultaneously: it generates the oscillating signal, provides phase control through injection timing, and maintains frequency synchronization through the locking mechanism. This multi-functionality eliminates the need for separate digital phase shifter circuits, reducing overall device complexity.
3Device complexity
If injection-locked phase rotator circuits operate without closed-loop frequency tracking, then device complexity is reduced, but stability against power, voltage, and temperature variations deteriorates
Solution Approach 1:
The patent implements a phase detector that continuously monitors the phase difference between output signals and generates a feedback control signal. This closed-loop feedback mechanism automatically compensates for variations caused by changes in power, voltage, and temperature, maintaining stable operation without requiring complex frequency tracking circuits. The feedback ensures that the injection timing adjusts dynamically to maintain optimal locking conditions.
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
The ILPR circuit achieves low-power, high-speed, and accurate phase control by stabilizing phase differences to 45 degrees, reducing power consumption and complexity, and maintaining precision despite environmental fluctuations.
Implementation Method 1
Injection-locked phase rotator circuits offer an innovative alternative by leveraging injection locking, where an external signal synchronizes the phase and frequency of an oscillator
Implementation Method 2
a phase detector circuit configured to receive the output clock signals and to generate a phase output signal based on phase differences of particular pairs of the output clock signals
Implementation Method 3
a phase to voltage circuit configured to receive the phase output signal, and to generate the phase control signal based on the phase output signal
Data Source
AI summary
An injection locked ring oscillator (ILRO) system is disclosed. The ILRO system includes an ILRO circuit configured to receive a plurality of injection control signals and a phase control signal, and to generate a plurality of output clock signals; a phase detector circuit configured to receive the output clock signals and to generate a phase output signal based on phase differences of particular pairs of the output clock signals; and a phase to voltage circuit configured to receive the phase output signal from the phase detector circuit, and to generate the phase control signal based on the phase output signal, where the phase control signal presents a negative feedback phase signal to the ILRO circuit for the phase differences in the particular pairs of the output clock signals.