A highly integrated single-chip inphase and quadrature (I/Q) modulator is implemented for low power mobile applications (AMPS, ADC, GSM). A quadrature carrier is generated internally without having an external phase shift network. Baseband signals can modulate these carriers directly in the 900 MHz range. A variable gain amplifier with good linearity performance is incorporated to meet tough digital cellular requirements for linear modulation. The device contains an on-chip frequency divider, a crystal osciillator, phase detector, and VCO, which combine to form a PLL for analog FM modsulation (pure AMPS system) and frequency synthesizing. It also has three additional dividers for generating clock signal for a micro-controller, DSP chip, and system timing unit. All the functions of the device are controlled by a three-wire data bus, which can be connected to the system micro-controller in the receiver. The I/Q modulator can achieve 40 dBc carrier and sideband suppression when single sideband modulation is applied.


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    Titel :

    Implementation of a 900 MHz transmitter system using highly integrated ASIC


    Weitere Titelangaben:

    Einführung eines Übertragungssystems bei 900 MHz mit hochintegrierten Kundenschaltungen


    Beteiligte:
    Djen, W.S. (Autor:in) / Shah, P.M. (Autor:in)


    Erscheinungsdatum :

    1994


    Format / Umfang :

    5 Seiten, 7 Bilder, 7 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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