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    350 mV, 0.5 mW, 5 GHz, 130 nm CMOS Class-C VCO Design Using Open Loop Analysis

    Szczepkowski, Grzegorz and Farrell, Ronan (2012) 350 mV, 0.5 mW, 5 GHz, 130 nm CMOS Class-C VCO Design Using Open Loop Analysis. In: 23rd Irish Signals and Systems Conference, June 28-29 2012, Maynooth, Ireland.

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    This paper presents a design method of LC cross-coupled oscillators using a large signal S-parameter open loop approach instead of typical negative resistance methodology presented in the liter- ature. The open loop technique allows extraction of loaded quality factor of the complete oscillator circuit and observe how oscillation conditions change with increasing oscillator signal amplitude. As a result, highly non-linear modes of oscillator operation (class-C in this case), can be analysed without necessity of conducting time consuming transient simulations. The presented method is not technology specific and allows fast calculations under changing bias conditions. The simulated class-C 130 nm CMOS oscillator operates at 5 GHz from a reduced power supply of 350 mV, achieving average SSB phase noise better than -115 dBc/Hz at 1 MHz offset from the carrier, using a relatively low loaded quality factor (QL ≈ 10) LC resonator. The presented VCO has tuning range of 280 MHz to compensate for process and temperature variations. In steady state, MOSFET devices in the oscillator operate in class-C i.e. for VGS <Vth, resulting in low power consumption of less than 0.5 mW RMS.

    Item Type: Conference or Workshop Item (Paper)
    Additional Information: This material is based upon works supported by the Science Foundation Ireland under Grant No. 10/CE/I1853. The authors gratefully acknowledge this support.
    Keywords: CMOS; voltage controlled oscillators; open loop analysis; large signal S-parameters;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 3954
    Depositing User: Ronan Farrell
    Date Deposited: 23 Oct 2012 14:53
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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