Design of complementary class-c oscillator with tail current source feedback and noise suppression for wireless applications / Pravinah Nair Shasidharan

Pravinah Nair, Shasidharan (2019) Design of complementary class-c oscillator with tail current source feedback and noise suppression for wireless applications / Pravinah Nair Shasidharan. Masters thesis, University Malaya.

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      Abstract

      The performance of low-powered transceivers are required to meet stringent specifications for an advanced wireless radio application. It is critical for a voltage-controlled oscillator (VCO) to meet multi-standard and multiband operation with low-power consumption and sufficient gain. This paper propose a novel technique for wide tuning range performance in a complementary class-C VCO employing a capacitive-source degeneration (CSD) to meet multi-standard operation for low-power transceivers. The technique which employs two sets of symmetrical split PMOS biased current source operating in subthreshold region achieves the desired low phase noise (PN) performance of below -120 dB/Hz at a tuning range of 2.2-to-2.9 GHz with a supply headroom of 1.2 V. The control of the dc bias point reduces the conduction angle which improves the current efficiency, power consumption and PN. Concurrently, an auxiliary �gm NMOS only class-B oscillator is incorporated to mitigate the start-up issue of the class-C VCO. At the center frequency of 2.45 GHz, the proposed VCO consumes a power of 1.73 mW, achieves a phase noise of -120 dBc/Hz at 1 MHz offset, and a figure - of - merit (FoM) of 185.41 dBc/Hz at 1 MHz. The total active chip area is only of 0.3-mm2 excluding bond pads. The proposed VCO serves as a promising solution for low-power wireless communication systems.

      Item Type: Thesis (Masters)
      Additional Information: Dissertation (M.A.) - Faculty of Engineering, University of Malaya, 2019.
      Uncontrolled Keywords: Class-C VCO; Capacitive Source Degeneration;(CSD) CMOS; Gate bias; Phase noise; (PN); Wireless applications; Low-power wireless communication systems
      Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
      Divisions: Faculty of Engineering
      Depositing User: Mrs Rafidah Abu Othman
      Date Deposited: 14 Jul 2020 07:40
      Last Modified: 14 Jul 2020 07:40
      URI: http://studentsrepo.um.edu.my/id/eprint/11400

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