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Design and Implementation of a Programmable VCO for DVB-H Application

Alizadeh Arand, Saralah | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41477 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Medi, Ali
  7. Abstract:
  8. Recent growth in wireless communications leads to higher demand for smaller and cheaper wireless products. This increasing demand for high speed wireless products and therefore development of new modulation techniques, results in higher sensitivity to phase deviations. This means that the voltage controlled oscillator or VCO circuit must has lower phase noise. VCO is an important part in Phase Lock Loop or PLL that has been used in most of transceivers. This thesis focuses on design of a Programmable VCO for DVB-H Application in 0.18um TSMC process. A VCO is an oscillator designed to be controlled in oscillation frequency by a voltage input. The frequency of oscillation is varied by the applied DC voltage. Since DVB-H system uses developed modulation techniques, the designed VCO must has low phase noise. Therefore some techniques have been used to reduce phase noise. A new noise filtering technique is proposed to reduce phase noise in a wide frequency tuning range. On the other hand this VCO is designed for a handheld system and must be low power. When more phase noise is tolerable, it is possible to reduce the bias current and increase phase noise and therefore, power consumption will decrease. So this thesis proposes a variable phase noise VCO.
  9. Keywords:
  10. Oscillator Phase Noise ; Voltage Controlled Oscillator ; Oscillators ; DVB-H Receiver ; Digital Video Broadcasting (DVB)

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