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Direction-Of-Arrival (DOA) detection is a challenge and a demanding task for several applications among industrial sensors and automotive radar where high accuracy, robustness, and low cost are important requirements. The six-port receiver based DOA detector has opened a whole new set of possibilities and implementations due to its accurate phase measurement properties. The DOA detection angle ambiguity...
The performance of the quadrature receivers are degraded due to the gain and phase mismatch in I and Q channels. In this paper we develop a mixed-mode technique for self calibration in quadrature receivers. A novel mismatch measurement and estimation scheme using an RF amplitude detector and the IC's digital core is shown. Then, digital and digitally-assisted analog correction is employed to remove...
Well-known receiver architectures such as heterodyne receivers and homodyne receivers usually require highly accurate component matching. In order to reduce the effort for the analog receiver front-end and to bridge the gap between system architectures and circuit technologies, the alternative Six-Port receiver was investigated. In this paper, we present a Five-Port Reflectometer applied as a direct...
The five(six)-port communication receiver uses one or two additional outputs in comparison with classical homodyne demodulators. This paper demonstrates for the first time the demodulation of RF signals and the regeneration of IQ-signals by means of a four-port receiver. This system comprises a four-port linear junction and two quadratic detectors with a square-law characteristic. A digital signal...
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