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Sökning: WFRF:(Tired Tobias) > (2011)

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1.
  • Nilsson, Magnus, et al. (författare)
  • A 9-band WCDMA/EDGE transceiver supporting HSPA evolution
  • 2011
  • Ingår i: [Host publication title missing]. - 0193-6530. ; , s. 366-368
  • Konferensbidrag (refereegranskat)abstract
    • The future of cellular radio ICs lies in the integration of an ever-increasing number of bands and channel bandwidths. This paper presents a transceiver together with the associated discrete front-end components. The transceiver supports 4 EDGE bands and 9 WCDMA bands (l-VI and Vlll-X), while the radio can be configured to simultaneously support the 4 EDGE bands and up to 5 WCDMA bands: 3 high bands (HB) and 2 low bands (LB). The RX is a SAW-less homodyne composed of a main RX and a diversity RX. To reduce package complexity with so many bands, we chose to minimize the number of ports by using single-ended RF interfaces for both RX and TX. This saves seve ral package pins, but requires careful attention to grounding. The main RX has 8 LNA ports and the diversity RX has 5, with some LNAs supporting multiple bands. On the TX side, 2 ports are used for all EDGE bands and 4 for the WCDMA bands.
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2.
  • TIRED, TOBIAS (författare)
  • A BiCMOS single ended multiband RF-amplifier and mixer with DC-offset and second order distortion suppression
  • 2011
  • Ingår i: Analog Integrated Circuits and Signal Processing. - : Springer Science and Business Media LLC. - 0925-1030 .- 1573-1979. ; 68:3, s. 269-283
  • Tidskriftsartikel (refereegranskat)abstract
    • Direct conversion receivers are widely used for full duplex mobile radio communication systems. This paper describes a novel SAW-less single-ended RF amplifier connected to a single-ended mixer with a feedback loop that suppresses the second-order distortion from TX cross modulation of the LO-leakage as well as DC-offset at the mixer output. In Monte Carlo simulations the design achieves +47 dBm minimum IIP2 with 32 dB conversion voltage gain. The advantage with the proposed architecture is that it is fully single-ended. Especially in multiband integrated radios this is highly desirable since the pin-count for the LNAs is reduced by half. The PCB routing of the RF input signal is simplified. The design requires two off-chip filter capacitors of non critical value intended to be placed on the laminate inside the package.
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