Compensation of DC-Offsets and RF-Self-Mixing Products in Six-Port-Based Analog Direct Receivers
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چکیده
The cancellation of DC-offsets and 2-order-type RF-self-mixing products (RFS2) is presented for six-port-based, analog direct receiver front-ends. It is shown that the signal dependent RFS2 comprising a dynamic DC-offset as well as the front-end dependent static DC-offset are generated systematically and not only by spurious effects unlike conventional, mixer-based front-ends. Due to this fact, it is possible to remove the DC-offsets and RFS2 before analog-to-digital conversion. In this article, it is explained how the DC-offset/RFS2 compensation can be mainly reduced to path mismatch cancellation within the front-end. For that purpose, appropriate front-end architectures are presented. In the ideal case, the proposed technique enables complete DCoffset and RFS2 cancellation.
منابع مشابه
Receiver Architectures
Topics 1. Main analog components for receivers-amplifiers-filters-mixers-oscillators 2. Receiver architectures and their properties-superheterodyne principle-direct conversion-DC offsets as a challenging problem-low IF, Weaver-effects of I/Q imbalance 3. Non-idealities and performance meatrics of the analog front-end modules-sensitivity, dynamic range-noise figure-intermodulation distortion, IP...
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تاریخ انتشار 2005