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Design of RF Frond-End for Wideband SAW-Less Software Defined Radio Receivers

Rasekh, Amir Hossein | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 51154 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Sharif Bakhtiar, Mehrdad
  7. Abstract:
  8. Removing SAW filter from the input of a receiver makes the receiver extremely vulnerable to all sorts of blockers and interferers. It is shown in this thesis that due to existing large out-of-band blockers the linearity of the saw-less receiver has to be considerably higher than that of the conventional receivers with input SAW filter. These ever-present and unwanted signals that show up in the absence of the input SAW filter are divided into two groups of far and near out-of-band blockers and interferers. It is shown that removing these groups of unwanted signals require two distinct approaches, one for near and the other for the far out-of-band blockers. An inclusive solution to protect the receiver against both groups of unwanted out-of-band signals is presented in this paper.Two methods for blocker and interferer rejection are introduced in this thesis. The first method employs active feedback to reject near out-of-band blockers. A method is also introduced to remove the far out-of-band blockers. Combination of these two methods enables the receiver to withstand all near and far out-of-band blockers. The proposed front-end is fabricated in 0.18um CMOS technology with the die area of 1.26mm2. The receiver covers communication standards within 700 MHz to 6 GHz bandwidth. In-band IIP3 is between -6 to 0.5 dBm and the effective out of band IIP3 is measured to be from .7dBm to as high as 33dBm
  9. Keywords:
  10. Communication Standards ; Wideband Receiver ; Complementary Metal Oxide Semiconductor Technology (CMOS) ; Software Defined Radio (SDR) ; Aaw-Less Receiver ; Active Feedback

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