Integrated Circuits for Linear and Efficient Receivers

Kim Östman

    Research output: ThesisDoctoral ThesisCollection of Articles

    Abstract

    This dissertation presents original research contributions in the form of five integrated circuit (IC) implementations and seven scientific publications. They present advances related to high-Q resonators, DC-DC converters, and programmable RF front-ends for integrated wireless receivers. Because these three building blocks have traditionally required implementations that are partly external to the IC, the ultimate target is to reduce system size, cost, and complexity. Wireless receivers utilize high-Q resonators for accurate frequency synthesis and signal filtering, typically by relying on external quartz resonators and rigid surface acoustic wave filters. The above-IC implementation of bulk acoustic wave (BAW) resonators and the use of programmable on-chip N-path filtering offer interesting integrable alternatives. Accordingly, this dissertation demonstrates a 2.1-GHz voltage controlled oscillator (VCO) in 250-nm SiGe:C BiCMOS, based on an above-IC BAW resonator. Furthermore, N-path filtering is investigated in a 2.5-GHz narrowband RF front-end in 40-nm CMOS. It achieves more than 10 dB of interferer filtering early in the RF chain, and the original analysis details the counter-intuitive behavior of the N-path filter when it is used together with LC-based filters. Receiver power management requires the use of step-down DC-DC converters between the external battery and the integrated receiver circuitry. The related switching regulators are typically based on low-frequency operation, which requires external filtering components. In contrast, this dissertation presents a fully integrated 3.6-to-1.8-V buck converter in 65-nm CMOS that uses switching frequencies of more than 100 MHz. A topology-independent switch bridge optimization approach is also proposed. The measurement results demonstrate the feasibility of integration, although with compromised performance. Finally, the software-defined radio paradigm operates on the premise of radio and RF front-end programmability. This calls for A/D conversion as close to the antenna interface as possible. This dissertation presents original work on a 40-nm CMOS direct delta-sigma receiver (DDSR) for the 0.7-to-2.7-GHz frequency range. Particular emphasis is put on developing new methods for DDSR RF front-end modeling and design.
    Translated title of the contributionMikropiirejä lineaarisiin ja tehokkaisiin vastaanottimiin
    Original languageEnglish
    QualificationDoctor's degree
    Awarding Institution
    • Aalto University
    Supervisors/Advisors
    • Ryynänen, Jussi, Supervising Professor
    • Stadius, Kari, Thesis Advisor
    Publisher
    Print ISBNs978-952-60-5930-3
    Electronic ISBNs978-952-60-5931-0
    Publication statusPublished - 2014
    MoE publication typeG5 Doctoral dissertation (article)

    Keywords

    • bulk acoustic wave resonator
    • direct delta-sigma receiver
    • low noise amplifier
    • quality factor
    • radio receiver
    • voltage controlled oscillator

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