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Dynamic range improvement of six-port receiver through analysis of output DC offset

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Abstract

In this paper, we improved the error vector magnitude (EVM) performance of six-port receiver using a low noise amplifier (LNA) bias control algorithm based on analyzing the correlation between normalized output DC offset voltage and EVM relative to input radio frequency (RF) power variation. In contrast to the other works published in the literature, we consider test setup through which the software impairments of six-port receiver blocks are considered. Therefore, in this work to substantiate the EVM improvement, a designed 26–30 GHz CMOS six-port receiver is used which consists of LNA, coupled line bandpass filter, six-port correlator, diode power detectors and two instrumentation amplifiers for recovering the baseband I/Q data. The EVM improvement process is assessed in terms of 64QAM modulation, and according to obtained results, EVM is reduced from 61% when using constant DC bias to 22% achieved with an LNA bias control algorithm for low input power (− 60 dBm) at the center frequency of 28 GHz. Moreover, the EVM is become less sensitive to input RF power, and also the dynamic range is improved more than 20 dB.

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Correspondence to Mehran Hazer Sahlabadi.

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Hazer Sahlabadi, M., Abdipour, A. & Mohammadi, A. Dynamic range improvement of six-port receiver through analysis of output DC offset. Analog Integr Circ Sig Process 103, 451–460 (2020). https://doi.org/10.1007/s10470-020-01622-z

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  • DOI: https://doi.org/10.1007/s10470-020-01622-z

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