Dual Phase Accumulators for Continuous Frequency Switching
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Solution Overview
Problem
Traditional signal generators using numerically controlled oscillators face challenges in maintaining continuous phase when switching between frequencies, leading to discontinuities in phase output, which is critical for frequency and phase management in quantum systems.
Innovation Solution
The integration of multiple phase accumulators with switches allows for seamless switching between frequencies while maintaining continuous phase, using a system with multiple phase accumulators and switches to manage phase continuity across different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single phase accumulator is used to change frequency by changing the phase increment, then frequency switching is achieved, but phase discontinuity occurs when switching back to the original frequency
Solution Approach 1:
The system divides the phase accumulation function into multiple independent phase accumulators (first phase accumulator for first frequency, second phase accumulator for second frequency). Each accumulator maintains its own continuous phase count independently, allowing seamless switching between frequencies without phase discontinuity.
Solution Approach 2:
The system pre-initializes each phase accumulator with a specific phase offset value before switching frequencies. When switching from the second frequency back to the first frequency, the first phase accumulator is re-initialized with a calculated offset that compensates for the time elapsed during the frequency switch, thereby maintaining phase continuity.
2Reliability
If multiple phase accumulators are used to maintain phase continuity, then phase continuity is achieved, but device complexity increases
Solution Approach 1:
The system uses a single local oscillator that serves multiple frequency functions by accepting phase values from different phase accumulators. The switch selectively connects the appropriate phase accumulator to the local oscillator based on the desired frequency, making the oscillator multi-functional while maintaining phase continuity.
Solution Approach 2:
The system changes the phase offset parameter of the active phase accumulator when switching frequencies. By calculating and applying appropriate phase offsets (first phase offset for first frequency, second phase offset for second frequency), the system maintains phase continuity across frequency transitions without requiring complex additional hardware.
Data Source
AI summary
An integrated phase accumulator apparatus includes a first phase accumulator, a second phase accumulator, and a switch. The first phase accumulator is configured to accumulate a first phase increment over time and provide a first accumulated phase value for signal generation via a local oscillator at a first frequency. The second phase accumulator is configured to accumulate a second phase increment over time and provide a second accumulated phase value for signal generation via the local oscillator at a second frequency. The switch is configured to switch the integrated phase accumulation apparatus between the first frequency and the second frequency and between the second frequency and the first frequency so as to maintain a first continuous phase for the first frequency and a second continuous phase for the second frequency.