Phase Synchronization Circuit Frequency Doubling for Cable Phase Alignment
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Solution Overview
Problem
Phase synchronization circuits used in multiple cable transmission paths fail to align phases correctly due to varying cable lengths and delay amounts, resulting in phase differences of π between synchronization signals at destinations, even when input signals are phase-aligned.
Innovation Solution
A phase synchronization circuit that includes a phase control unit, a signal returning unit, and a frequency multiplier to adjust and align phases by doubling the frequency of the transmission signal outputted from the cable, ensuring phase alignment across multiple transmission paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a phase synchronization circuit is installed in each cable to stabilize phase differences between transmitted signals and reflected signals, then phase stability of individual cable signals is improved, but phase alignment between synchronization signals at multiple destinations deteriorates due to different cable lengths causing phase differences of π
Solution Approach 1:
The patent changes the frequency parameter of the signal by using a frequency multiplier to double the frequency. This parameter change transforms the phase relationship: while original signals at different destinations had phase differences of π due to different cable lengths, the doubled-frequency signals achieve phase alignment because the phase difference becomes 2π, which is equivalent to 0 phase difference. This resolves the contradiction by modifying a physical parameter (frequency) to achieve both stability and alignment.
Solution Approach 2:
The patent moves the problem from the time domain (phase alignment issue) to the frequency domain by applying frequency multiplication. By operating in another dimension (frequency domain instead of time domain), the solution achieves phase alignment across multiple transmission paths. The frequency doubling transforms the phase relationship mathematically, allowing synchronized output despite different transmission path lengths.
2Reliability
If phase control is performed using round-trip signals with feedback control to maintain phase difference equal to 2nπ, then phase difference between transmitted and reflected signals is stabilized, but the determined integer n varies for each cable causing synchronization signal phases to differ by π at destinations
Solution Approach 1:
The patent applies frequency multiplication to change the frequency parameter, which simultaneously changes the phase relationship. By doubling the frequency, the phase difference between signals from different cable lengths transforms from π to 2π (equivalent to 0). This parameter change makes the system adaptable to different cable lengths while maintaining synchronization accuracy, resolving the contradiction between control accuracy and cable length adaptability.
Data Source
AI summary
In a case where signals branched from a single reference signal source are transmitted via a plurality of cables, a phase synchronization circuit can be used to stabilize a phase of a signal to be outputted from each cable. However, the phases of signal to be outputted from each cable is affected by combination of a length of each cable and an amount of delay caused by feedback control, so that phases of synchronization signals to be outputted from a plurality of transmission paths are not always the same as each other. In the present invention, since a frequency multiplier that multiplies a frequency of a signal outputted from each transmission path by an even number is provided for a phase synchronization circuit, the phases of the synchronization signals to be outputted from the transmission paths are aligned even when signals are branched from one reference signal.