Pseudo-Random Frequency Signal Generation via Phase Decoupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spread-spectrum techniques face challenges in generating pseudo-random frequency signals with both random frequency and phase, often resulting in non-random phases due to phase alignment with clock signals or injection locking in oscillators.
Innovation Solution
A system comprising an oscillator and a signal generator that generates a pseudo-random control signal, where the frequency and phase of the oscillation signal are determined by the control signal, and the control signal is synchronized with the oscillation signal, allowing for true randomness in both frequency and phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing spread-spectrum techniques use clock signals or injection locking in oscillators, then the system operation is stable and controllable, but the phase alignment with clock signals limits the randomness of the generated signal
Solution Approach 1:
The patent extracts the phase control function from the traditional clock-synchronized oscillator system. By separating phase modulation into a distinct pseudo-random sequence generator that operates independently of the clock signal, the system achieves both stability (from the clocked oscillator) and phase randomness (from the independent pseudo-random generator). This extraction resolves the contradiction by allowing each component to fulfill its specialized function without interference.
Solution Approach 2:
The patent introduces a pseudo-random phase sequence as an intermediary between the clock signal and the oscillator phase control. This intermediary layer allows the oscillator to remain stable and clock-synchronized while the pseudo-random sequence modulates the phase, adding the required randomness. The intermediary enables both stability and randomness to coexist by decoupling their control mechanisms.
2Reliability
If the control signal is synchronized with the oscillation signal, then the system operation is reliable, but the phase alignment reduces the true randomness of frequency and phase
Solution Approach 1:
The patent segments the control signal into two independent components: a frequency control signal that updates at clock intervals (providing reliability) and a phase control signal that updates at oscillator zero-crossings (providing randomness). This segmentation allows each component to be optimized independently - the frequency control maintains synchronization and stability, while the phase control introduces true randomness through its event-driven update mechanism.
Solution Approach 2:
The patent implements dynamic update timing for the phase control signal, where updates occur at random intervals determined by oscillator zero-crossing events rather than fixed clock cycles. This dynamic approach allows the phase to change unpredictably while the frequency remains stable and synchronized. The system adapts its update timing based on oscillator behavior, achieving both reliability and randomness.
Data Source
AI summary
A system configured to generate a signal with a random or pseudo-random frequency may include an oscillator and a signal generator. The oscillator may be configured to generate an oscillator signal. A frequency and a phase of the oscillator signal may be random or pseudo-random and may be based on a value of a received control signal. The signal generator may be configured to generate the control signal based on the oscillator signal and a seed state. The value of the control signal may be random or pseudo-random.