High Frequency Distortion Analysis of a Semiconductor Diode for CATV Applications

Procházka, A.; Neumann, Rüdiger

doi:10.1109/tce.1975.266690

Cited by 12 publications

(1 citation statement)

References 8 publications

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“…According to (7), (8), (12), (13), (21) and (22), the computation complexity of proposed algorithm is relatively low which requires 6 FFT operations and a few multiplication and addition operations, as compared to the computation complexity of the conventional algorithm, which requires matrix inverse operations is . As to the cost, this proposed algorithm only requires a wideband diode and ADC, which is more cost effective than the conventional method, which uses external/internal modulator or even instruments.…”

Section: Fig 6 Test Platformmentioning

confidence: 99%

Self-IQ-Demodulation Based Compensation Scheme of Frequency-Dependent IQ Imbalance for Wideband Direct-Conversion Transmitters

Zhang

Huang

et al. 2015

IEEE Trans. on Broadcast.

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A low cost frequency-dependent (FD) I/Q imbalance self-compensation scheme is investigated in this paper. The direct conversion transmitters are widely used in wireless systems. However, the unwanted image-frequencies and distortions are inevitably introduced into the direct conversion system. This problem is even severer in wideband systems. Therefore, the accurate estimation and compensation of I/Q imbalance is crucial. The current compensation method is based on external instruments or internal feedback path which introduces additional impairments and is expensive. This paper proposes a low cost FD I/Q imbalance self-IQ-demodulation based compensation scheme without using external calibration instruments. First, the impairments of baseband and RF components are investigated. Further, I/Q imbalance model is developed. Then, the proposed two-step self-IQ-demodulation based compensation scheme is investigated. In the first step of the scheme, the local oscillator (LO) related I/Q impairments parameters are estimated. Then in the second step, the overall FD I/Q imbalance parameters are estimated by utilizing the transmitter LO. To realize this self-IQ-demodulation algorithm, this paper introduces minor modifications to the current power detector circuit. Afterwards, the estimated parameters are applied to the baseband equivalent compensator. This sophisticated algorithm guarantees low computation complexity and low cost. The compensation performance is evaluated in laboratory measurement.

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Section: Fig 6 Test Platformmentioning

confidence: 99%