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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 50726 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Atarodi, Mojtaba
- Abstract:
- In this dissertation a special category of RF filters known as multi-path filters are introduced, chracterized and implemented. The center frequency of the multi-path filters can be tuned by changing the frequency of the clocks applied to the filter, which makes them attractive for use in multi-standard receivers. In this thesis, different types of multi-path filters are studied and by proposing different circuits, their various applications are covered. First, the concept of multi-path filters and their chracteristics are studied. Then a novel technique to analyze these filters based on Fourier analysis is proposed and then, based on this analysis, a new circuit architecture with reduced harmonic fold-back effects is designed and simulated. Then, another multi-path feedforward active filter with Gm-C architecture capable of simultaneously tuning its center frequency along with the channel bandwidth in a broad frequency range is designed, implemented and measured. In the end, two other types of multi-path filters are described and a design example for each type of filter is discussed. First, complex multi-path filters are introduced and a complex four-path filter by means of Gyrators is proposed and simulated. Finally, a four-path filter with ability to change the center frequency and channel bandwidth by means of a frequency dependent negative resistance (FDNR) is designed and simulated
- Keywords:
- Low Noise Amplifier (LNA) ; Bandpass Filters ; Active Filter ; Software Defined Networking (SDN) ; Multi-Path Filters ; Transconductor-Capacitor Filter
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