4 research outputs found

    Efficient start-up of crystal oscillators

    Get PDF

    Crystal Oscillator Circuit and Method of Operation

    Get PDF
    A crystal oscillator circuit (100, 200) is described that includes a crystal resonator (220); and a voltage source (204) configured to apply a voltage step across the crystal oscillator (220) where a polarity of the voltage source (204) applied to the crystal resonator (220) is switched in response to a sign of a current passing through the crystal resonator (220) and in response thereto a self-timed energy injection waveform is provided to the crystal resonator (220)

    The application of linguistic principles in programming: Phonemic transcription and phonotactic constraints

    Get PDF
    Wydzia艂 AnglistykiG艂贸wnym celem pracy jest przedstawienie procesu projektowania, tworzenia i wykorzystania dw贸ch aplikacji, Transkryptora oraz Kalkulatora Fonotaktycznego, kt贸re zosta艂y stworzone przez autora dysertacji w ramach jego prac nad automatyczn膮 transkrypcj膮 tekst贸w i fonotaktyk膮. Transkryptor jest narz臋dziem pozwalaj膮cym na szybk膮 konwersj臋 tekstu w j臋zyku angielskim z reprezentacji ortograficznej do formatu ustandardyzowanej transkrypcji fonemicznej. Wynik konwersji znajduje zastosowanie w pracy dydaktycznej, jak i badawczej. Drugie narz臋dzie pozwala na obliczenie poziomu preferencyjno艣ci zbitek zgodnie z za艂o偶eniami fonologii Bit贸w i Wi膮za艅. Wykorzystanie programu w znaczny spos贸b usprawnia proces obliczania preferencyjno艣ci zbitek. Przed艂o偶ona praca przedstawia ca艂y proces opracowania aplikacji, gdy偶 prezentuje opis dost臋pnej w danych obszarach wiedzy stanowi膮cej podstaw臋 teoretyczn膮 dla narz臋dzi. Nast臋pnie dysertacja szczeg贸艂owo opisuje obie aplikacje prezentuj膮c algorytmy w formie pseudokodu. W ostatniej cz臋艣ci pracy zaprezentowano wyniki szeregu bada艅 (w tym bada艅 w艂asnych autora) przeprowadzonych przy u偶yciu opisywanych narz臋dzi.The major aim of this dissertation is to present the process of designing, developing and deploying two applications, Transkryptor and the Phonotactic Calculator, created by the author in the course of his studies of the automatic text transcription and phonotactics. Transkryptor is a tool which allows for quick transcription of an orthographical representation of a piece of text in English into a standardized phonemic notation. The result of the operation can be used for didactic or research purposes. The second tool allows for calculating the cluster preferability within the Beats-and-Binding theory of phonology. Thanks to the application, preferability computations can be performed in a more efficient way. The thesis presents the entire process of development of the applications as it starts with the description of the state-of-the-art knowledge in the areas which comprise the theoretical base for the programs. Then, both applications are described in detail, with pseudo-coded algorithms provided. Finally, the dissertation presents a number of studies (including ones carried out by the author of the thesis) conducted with the help of the tools

    Range pre-selection sampling technique to reduce input drive energy for SAR ADCs

    Get PDF
    A Range Pre-selection Sampling (RPS) technique is introduced to reduce the input drive energy for SAR ADCs and is applied to a 10-bit 2MS/s SAR ADC in 65nm CMOS in this paper. Using the proposed RPS technique, the peak input sampling current and hence the input drive power requirement is reduced by a factor 2.4 as compared to conventional sampling (CS). Considering an ideal Class A operation for the buffer circuit driving the ADC, this translates into a minimum (theoretical) driver power consumption of 50渭W for our RPS based ADC whereas it is 130渭W for the conventional sampling, both much larger than the ADC power consumption of 3.25渭W at 1MS/s operation. Our ADC occupies an area of 0.08 mm2and achieves an SFDR of 64 dB, an SNDR of 55 dB with a Walden Figure of Merit, FoMw of 6.8fJ/conversion-step at up-to 2MS/s
    corecore