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Design and Implementation of Fully Integrated Frequency Synthesizer for Biomedical Applications

Aghlmand, Fatemeh | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41925 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Atarodi, Mojtaba
  7. Abstract:
  8. Fully integrated frequency synthesizer is one of the important system-on-chips building blocks. Among this circuit’s remarkable applications, Bioelectronics field is very common. In these applications, advanced microelectronic circuits are used in order to diagnosis and treatment of diseases. The aim of this thesis is design and implementation a wideband frequency synthesizer in a 0.18um CMOS technology. The main usage of this circuit is in a fully integrated implantable biomedical sensory chip. This circuit generates two necessary local signals in sensory chip to stimulus cells and process the information.
    Frequency synthesizer is based on phased locked loop (PLL) circuit and produce local signals in 800-1200 MHz range with 1 MHz step. In this design, for the first time, instead of using an external crystal oscillator as reference generator, one new low area and low power relaxation oscillator is introduced. By this work, the entire system including biomedical sensor can be integrated in one single chip and implanted in patient’s body. This system has two simultaneous outputs: one is the PLL’s output at ωout frequency and other’s frequency is ωout -1MHz. Since both of these signals are required in I and Q form, two single sideband mixers are used. Simulation results for this system show that, its low power and low area characteristics make it an appropriate choice to use in integrated biomedical systems
  9. Keywords:
  10. Biosensor ; Complementary Metal Oxide Semiconductor Technology (CMOS) ; Frequency Synthesizer ; Relaxation Oscillation

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