Configurable FLL/PLL Oscillator for Reference-Free Clock Synchronization
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Solution Overview
Problem
In systems with multiple converters, such as electric vehicles, synchronizing the clocks of various monitors is challenging, especially in high-voltage environments where providing a reference clock is impractical.
Innovation Solution
The implementation of an integrated circuit with a configurable oscillator circuit that can switch between frequency-locked loop (FLL) and phase-locked loop (PLL) modes, allowing for clock synchronization without a reference clock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference clock is provided to synchronize multiple converters, then clock synchronization accuracy is improved, but device complexity and impracticality increase in high-voltage environments
Solution Approach 1:
Each converter is equipped with its own oscillator circuit that generates its own clock signal. The oscillator includes a frequency-locked loop that automatically synchronizes multiple converters without requiring an external reference clock, making the system self-synchronizing and eliminating the need for complex reference clock distribution in high-voltage environments
Solution Approach 2:
The oscillator circuit employs a frequency-locked loop with feedback mechanism that continuously monitors and adjusts the clock frequency to maintain synchronization across multiple converters. The feedback control ensures that all converters operate synchronously by detecting frequency deviations and correcting them automatically
2Ease of operation
If an oscillator circuit is configured as a frequency-locked loop, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The oscillator circuit is designed to be dynamically reconfigurable, allowing it to switch between frequency-locked loop mode and phase-locked loop mode based on operational requirements. This dynamic configuration enables the system to optimize between ease of operation and measurement precision depending on the specific application context
Solution Approach 2:
The oscillator circuit serves multiple functions by implementing both frequency-locked loop and phase-locked loop capabilities within a single integrated design. This multi-functionality allows the same hardware to operate in FLL mode for general synchronization tasks and switch to PLL mode when higher phase synchronization accuracy is required
Data Source
AI summary
An integrated circuit (IC) includes an oscillator circuit having a control input. A control circuit has a control output coupled to the control input. The control circuit is configured to generate a control signal to the control input of the oscillator circuit to cause: the oscillator circuit to be configured as a frequency-locked loop in response to the control signal being in a first state; and the oscillator circuit to be configured as a phase-locked loop in response to the control signal being in a second state.