Carrier leakage suppression and EVM dependence on phase shifting network in six-port modulator

Osth, Joakim; Karlsson, Magnus; Serban, Adriana; Gong, Shaofang

doi:10.1109/icmmt.2012.6230247

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Numerically the exact EVM can be calculated. The EVM [16], [26] is calculated by minimizing the function…”

Section: Resultsmentioning

confidence: 99%

“…The bandwidth with an acceptable amplitude and phase imbalance and then an acceptable EVM is quite limited in a branch-line coupler. Therefore the coupler responsible for IQ separation is implemented by using a Wilkinson power divider together with a broadband phase shifting network [16], [25]. As seen in Fig.…”

Section: Prototype Designmentioning

confidence: 99%

“…T HERE have been much interest recently in using sixport correlators in communication devices [1]- [16]. Many studies have been done on demodulators where a six-port correlator is used together with power detectors to generate the baseband in-phase (I) and quadrature-phase (Q) data [2]- [7], [17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Comparative Study of Single-Ended vs. Differential Six-Port Modulators for Wireless Communications

Osth

Karlsson

Serban

et al. 2015

IEEE Trans. Circuits Syst. I

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If present, nonlinear effects in a six-port modulator cause distortion and degradation of the quality of the modulated output waveform. How nonlinear effects occur and their impact on system performance were derived in a mathematical model. The model shows that non-ideal performance of the passive sixport correlator is the main contributor to nonlinear distortion. Simulations and measurements on two manufactured six-port modulators were used to validate the theory and to give deeper insight on system performance. It is shown that by using a differentially signaled six-port modulator instead of a singleended six-port modulator, better performance is achieved over a wide bandwidth. For an error vector magnitude of less than 10%, the relative bandwidth was measured to 12% for the single-ended but 30% for the differentially signaled modulator.

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“…Numerically the exact EVM can be calculated. The EVM [16], [26] is calculated by minimizing the function…”

Section: Resultsmentioning

confidence: 99%

Section: Prototype Designmentioning

confidence: 99%

See 1 more Smart Citation

A Comparative Study of Single-Ended vs. Differential Six-Port Modulators for Wireless Communications

Osth

Karlsson

Serban

et al. 2015

IEEE Trans. Circuits Syst. I

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“…Supplementary, the analog/RF processing of signals by means of simple microwave techniques, as those presented in [15]- [17], has proven the diminution of LO-leakage, which represents a typical problem for direct conversion radio architectures resulting in DC-offsets.…”

Section: Six-port Modulator Dependenciesmentioning

confidence: 99%

Multiport Technology: The New Rise of an Old Concept

et al. 2014

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Abstract-A short review of the multiport (six-port) theory for modern applications in downconversion, direct demodulation or modulation of RF signals, and new measurement techniques for localization is presented in this paper. More than four decades ago, the circuit was developed for low-cost S-parameter measurements of microwave circuits. The modifications required to transform original six-port instrument function to radio function was not obvious in the beginning. In this purpose, several innovations have been implemented during the last two decades. Implementations of the circuit in various mature fabrication technologies, covering frequencies from microwave to millimeter wave spectrum, are presented and discussed. Multiport receiver calibration and impairment mitigation techniques are also proposed at frequencies where analog-to-digital converters and digital signal processing are available.

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