Vector measurement of modulated RF signals by an in-phase and quadrature referencing technique

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Vector measurement of modulated RF signals by an in-phase and quadrature referencing technique

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Vector measurements of modulated RF signals are demonstrated using a sampling oscilloscope with in-phase and quadrature referencing. Certain sampling oscilloscope designs exhibit sub-picosecond time-correlation between channels. This correlation allows independent referencing of the carrier frequency and the modulation signals. This measurement technique, which can be implemented using simple RF components, provides an alternative to real-time digitising oscilloscopes or real-time spectrum analysers and can be used at higher RF frequencies than is currently possible with these other methods for repetitive RF waveforms. Experimental results are presented for a pulsed RF power application and for 4QAM, 16QAM and DQPSK wireless communication coding schemes.

Inspec keywords: correlation methods; differential phase shift keying; quadrature phase shift keying; quadrature amplitude modulation; oscilloscopes; microwave measurement; signal processing

Other keywords: pulsed RF power application; quadrature referencing technique; sampling oscilloscope; modulated RF signals; carrier frequency; modulation signals; real-time spectrum analysers; vector measurement; wireless communication coding scheme; channel time correlation

Subjects: Microwave measurement techniques; Signal processing and detection; Display, recording and indicating instruments; Modulation and coding methods

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