A novel measurement method for incidental PM at AM

作者：Zhou Feng^*; Zhang Rui; Gao You Gang; Ruan Fang Ming; Shen Yuan Mao; Shi Dan

来源：Acta Electronica Sinica, 2012, 40(3): 592-594.

DOI：10.3969/j.issn.0372-2112.2012.03.030

• Digital demodulation
• Frequency domains
• Magnitude error
• Measure
• Measurement methods
• Measurement results
• Phase error
• Time domain
• Vector analysis

When to measure the incidental PM at AM, because in time domain and frequency domain, AM and PM are accompanied but not independent, so it';s difficult to measure incidental PM. Traditional method by spectrum analysis is complex, and is only applicable to situation with small PM index. A new method is proposed: Under a particular frequency Relationship, by digital vector demodulation and sampling, to transform the AM and PM to magnitude error and phase error in IQ domain independently, on the measurement rules, there is analytical relationship between digital demodulation phase error and the analog incidental PM. For a total of 120 cases of parameters combination, experiment is carried out; the measurement results confirmed that the method is accurate.

• 出版日期2012
• 单位北京大学