FSK Waveform Generator Phase Continuity
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Solution Overview
Problem
Waveform generators face issues with spurious signals when repeatedly outputting arbitrary waveforms due to discontinuity between the initial and final phases during FSK modulation, leading to inaccurate device testing.
Innovation Solution
A waveform generator with a data changing section that modifies the input data sequence to ensure continuous initial and final phases during FSK modulation, combined with a waveform generating section that produces basic waveform data for output, reducing spurious signals by maintaining phase continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If arbitrary waveform data is repeatedly output by FSK modulation, then productivity is improved, but spurious signals are generated due to phase discontinuity
Solution Approach 1:
The patent applies preliminary action by modifying the input data sequence before FSK modulation to ensure phase continuity. Specifically, the system adjusts the phase of the initial part and/or final part of the data sequence in advance, so that when the waveform is repeated, the phases connect continuously without generating spurious signals. This preprocessing step eliminates the harmful effect before the repeated output operation occurs.
2Adaptability or versatility
If FSK modulation is applied to arbitrary data, then adaptability is improved, but phase discontinuity occurs between initial and final phases
Solution Approach 1:
The patent applies parameter changes by modifying the phase parameter of the input data sequence. The system changes the phase of the initial part and/or final part of the data sequence to ensure that the phase values are continuous when the waveform repeats. This parameter adjustment maintains stability in the phase composition while preserving the adaptability to generate arbitrary waveforms through FSK modulation.
Data Source
AI summary
There is provided a waveform generator for generating an analog signal, including a data changing section which changes an input data sequence, which is to be modulated to the signal which the waveform generator should generate, to generate an after-change data sequence such that an initial phase and a final phase of the signal to be obtained by FSK modulation are continuous, a waveform generating section which generates basic waveform data representing a waveform corresponding to the signal obtained by subjecting the after-change data sequence to FSK modulation, and an output section which outputs the signal repeating the waveform represented by the basic waveform data.