VLSI Implementation of VCO

Design and VLSI Implementation of VCO for High Speed RF Applications

Abstract—Voltage-Controlled Ring Oscillators are crucial components in many wireless
communication systems. VCRO is used in PLL circuit, used to generate the oscillations and
increase the speed of the whole system for RF wireless communication such as 60GHz

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    voltage controlled oscillator

    The phd thesis on Design and Characterization of RFIC Voltage
    Controlled Oscillators in Silicon Germanium HBT
    and Submicron MOS Technologies

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    Advances in wireless technology have recently led to the potential for higher data
    rates and greater functionality. Wireless home and business networks and 3G and
    4G cellular phone systems are promising technologies striving for market acceptance,
    requiring low-cost, low-power, and compact solutions. One approach to meet these
    demands is system-on-a-chip (SoC) integration, where RF/analog and digital circuitry
    reside on the same chip, creating a mixed-signal environment. Concurrently, there
    is tremendous incentive to utilize Si-based technologies to leverage existing fabrication
    and design infrastructure and the corresponding economies of scale. While the
    SoC approach is attractive, it presents major challenges for circuit designers, particularly
    in the design of monolithic voltage controlled oscillators (VCOs). VCOs
    are important components in the up or downconversion of RF signals in wireless
    transceivers. VCOs must have very low phase noise and spurious emissions, and be
    extremely power efficient to meet system requirements. To meet these specifications,
    VCOs require high-quality factor (Q) tank circuits and reduction of noise from active
    devices; however, the lack of high-quality monolithic inductors, along with low noise
    transistors in traditional Si technologies, has been a limiting factor.