Waveform Generator Frequency Characteristic Measurement
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Solution Overview
Problem
Existing waveform generators and digitizers face significant errors in measuring high-frequency signal frequency characteristics due to internal circuit frequency characteristics, especially when using square waves, which result in large errors in the high-frequency band.
Innovation Solution
A measurement apparatus and method that sequentially outputs sine wave signals of different frequencies from a waveform generator, using a control section to synchronize these signals with a trigger signal, and a measuring section to accurately measure and calculate the frequency characteristics using an oscilloscope, thereby correcting the frequency characteristics to achieve flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a square wave is used to measure frequency characteristics, then the measurement method is simple, but large errors occur in the high frequency band due to power degradation
Solution Approach 1:
The patent changes the waveform parameter from square wave to sine wave to eliminate power degradation at high frequencies. The sine wave maintains consistent power across the frequency band, enabling accurate frequency characteristic measurements without the errors that plague square wave measurements in the high frequency range.
Solution Approach 2:
The patent employs periodic sine wave signals at different frequencies to sequentially measure frequency characteristics. By using periodic action with controlled frequency variation, the system achieves comprehensive frequency band coverage while maintaining measurement accuracy through the inherent properties of sine waves.
2Measurement precision
If sequential sine wave output is used, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent measures frequency characteristics at multiple discrete frequency points rather than continuously across the entire band. This partial action approach captures the essential frequency response behavior while significantly reducing measurement time compared to exhaustive continuous sweeping.
Solution Approach 2:
The system performs preliminary setup of the sine wave generator and measurement apparatus before actual frequency measurements begin. This preliminary configuration reduces setup time during the measurement process and enables faster sequential measurements across different frequencies.
Data Source
AI summary
To accurately measure a frequency characteristic of a waveform generating apparatus, provided is a measurement apparatus that measures a frequency characteristic of a waveform generating apparatus generating a signal having a waveform corresponding to waveform data, comprising a control section that causes a plurality of sine wave signals having different frequencies to be sequentially output from the waveform generating apparatus; a measuring section that measures each of the sine wave signals output from the waveform generating apparatus; and a calculating section that calculates a frequency characteristic of the waveform generating apparatus based on the measurement results of the measuring section. The control section causes trigger signals to be output from the waveform generating apparatus and causes the sine wave signals to be output in synchronization with the trigger signals, and the measuring section measures a phase of each sine wave signal with the corresponding trigger signal as a reference.