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Design of a Reconfigurable Low Noise Amplifier with Blocker Filtering at the Input Stage

Akbar, Fatemeh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43878 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Atarodi, Mojtaba
  7. Abstract:
  8. This project introduces a topology enabling a Low-Noise Amplifier (LNA) not only to attenuate the unwanted signals at the input stage but also to satisfy the input matching requirement in an ultra wide frequency band. Moreover, a single ended to differential signal conversion method is proposed. This method employs a noise reduction idea, so it has a lower noise figure compared to the other introduced methods with the same purpose. The introduced methods have been utilized in designing two 0.18μm reconfigurable CMOS LNAs. One of the designed LNAs covers 2.3-3.6 GHz band width and the other one covers the UHF (470-860MHz) band. Stringent sensitivity requirement, presence of strong in-band interferers, and the wide operation are the main design challenges of the UHF band receiver and the applicable LNA should be highly linear to provide the required sensitivity in presence of so many in-band interferers. However, applying the introduced method enabling the LNA to attenuate the unwanted signals makes the severe constraint of linearity more relaxed. Also, there is a high demand of highly linear LNAs in multi band receivers to equip such receivers with a proper sensitivity despite the presence of so many interferers. Hence, the introduced method can be a good alternative for these kinds of receivers as well
  9. Keywords:
  10. Low Noise Amplifier (LNA) ; Noise Reduction ; Coordinated Tuning ; Reconfiguration ; Single-Ended to Differential Signal Conversion

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