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Design and Implementation of Integrated Broadband Low-Noise Amplifier

Nikandish, Gholamreza | 2014

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 46645 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Medi, Ali
  7. Abstract:
  8. Broadband low-noise amplifiers (LNAs) find widespread application in many communication and measurement systems, and extensive research efforts have been devoted to improve their performances. The main efforts include the system bandwidth enhancement for increasing the data rate, the system noise reduction for improving sensitivity of receivers, and lowering the power consumption for increasing battery life of handheld systems. There is a steady quest to develop novel circuit architectures and design methodologies that can pave the way for performance enhancement of overall system.In this thesis, the design and implementation of a broadband low-noise amplifier circuit is investigated. The final target is to design an integrated circuit with bandwidth of about 40 GHz, gain of 20 dB, average noise figure of 2.5 dB, with minimum power consumption. The two popular broadband amplifier structures are distributed amplifier and multistage amplifier with interstage bandwidth enhancement circuits. In this research, both architectures are considered and several techniques are developed to improve their performances. The main results of the research can be summarized as follows:(1) An unilateralization technique for distributed amplifier using transformer coupling between its input and output lines to improve bandwidth of the amplifier.(2) A method for analysis and optimization of nonuniform distributed amplifier to improve its noise figure.(3) A bandwidth enhancement technique for broadband Darlington amplifier.(4) A transformer feedback interstage bandwidth enhancement technique for multistage amplifiers.The research approach is as follows. First, the proposed technique is analyzed theoretically. Then, a circuit design method using the proposed technique is provided. Finally, experimental results of the fabricated chips are presented
  9. Keywords:
  10. Transformers ; Distributed Amplifier ; Low Noise Amplifier (LNA) ; Monolitic Microwave Integrated Circuit (MMIC) ; Bandwidth Enhancement ; Broadband Amplifier

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