Extension of an absolute vector error correction technique to wideband, high-frequency measurements

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Extension of an absolute vector error correction technique to wideband, high-frequency measurements

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The authors have previously demonstrated how a transmitter (Tx), a reciprocal transmitter/receiver (Tx/Rx) signal path and two unidirectional receiver (Rx) paths can be used together with short, open and load standards for the absolute vector error correction (AVEC) of a Tx/Rx module. Once calibrated, this Tx/Rx module can then provide accurate vector measurements of the signals that are flowing into and/or out of the test port. In order to simplify the analysis, the AVEC technique was applied to a simplified baseband circuit that did not include frequency conversion mixers in a previous paper. Now, in this paper the authors first show how the AVEC technique can be extended to the vector calibration of high-frequency receivers that involve frequency conversion mixers. The authors then show how to calibrate a system that allows for wideband absolute phase relationship measurements of periodic modulated signals, provided that the same local oscillator is employed for the two down-conversion receivers, and different radio frequencies and intermediate frequencies are employed in these receivers. This novel AVEC technique is one of the key concepts in the design of a wideband absolute vector signal measurement system, which overcomes the limitations of traditional measurement instruments by combining the features of vector signal analysers, spectrum analysers and vector network analysers.

Inspec keywords: radio receivers; calibration; frequency measurement; error correction; spectral analysers; mixers (circuits)

Other keywords: spectrum analysers; local oscillator; simplified baseband circuit; vector network analysers; reciprocal transmitter/receiver; vector signal analysers; high-frequency measurements; unidirectional receiver paths; frequency conversion mixers; absolute vector error correction technique

Subjects: Modulators, demodulators, discriminators and mixers; Network and spectrum analysers; Radio links and equipment; Measurement standards and calibration; Frequency measurement

References

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