Digitally Controlled Envelope Tracking Power Supply for an RF Power Amplifier

Lars Tønnes Jakobsen, Michael Andreas E. Andersen

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    A new Digital Self-Oscillating (DiSOM) modulator is presented in this paper. The advantage of the DiSOM is that it allows the sampling frequency of the digital compensator to be higher than the switching frequency, but it also has the ability to shape the quantization noise on the switching output due to clock frequency quantization. An envelope tracking power supply for an RF Power Amplifier (RFPA) can help improve system efficiency by reducing the power consumption of the RFPA. To show the advantage of the DiSOM over traditional counter based Digital PWM modulators two designs were compared in both simulation and by experiment. The results shows that the DiSOM could give an increase in open loop bandwidth by more than a factor of two and an reduce the closed loop output impedance of the power supply by a factor of 5 at the output filter resonance frequency.
    Original languageEnglish
    Title of host publicationInternational Telecommunications Energy Conference
    Publication date2007
    ISBN (Print)978-1-4244-1627-1
    Publication statusPublished - 2007
    EventInternational Telecommunications Energy Conference - Rome, Italy
    Duration: 1 Jan 2007 → …
    Conference number: 29


    ConferenceInternational Telecommunications Energy Conference
    CityRome, Italy
    Period01/01/2007 → …

    Bibliographical note

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