Publications (2)0 Total impact

  • Source
    T. Rahkonen · S. Tammelin · J. Kostamovaara
    [Show abstract] [Hide abstract]
    ABSTRACT: An analog FM modulator operating within the loop bandwidth of a frequency synthesizer is presented. Its operation is based on delay-modulating the reference frequency of the synthesizer PLL, thus causing phase modulation in the synthesized carrier. To convert delay-control to FM, modulating input is first integrated. The modulator circuit is implemented in a 1.2┬Ám BiCMOS process, has 2.8 V supply voltage and 1.5 mA supply current. In in-system tests, the modulator showed 7 kHz/V gain, 20 Hz(rms) residual FM and -31..-37 dB THD on audio band.
    Full-text · Conference Paper · Oct 1997
  • T. Rahkonen · S. Tammelin · J. Kostamovaara
    [Show abstract] [Hide abstract]
    ABSTRACT: An analog FM modulator operating within the loop bandwidth of a frequency synthesizer is presented. Its operation is based on modulating the propagation delay of the reference frequency of the synthesizer PLL, thus causing phase modulation in the synthesized carrier. The modulator circuit is implemented in a 1.2 um BiCMOS process, has 2.8 V supply voltage and 1.5 mA supply current. In the in-system tests, the modulator showed 7 KHz/V gain, 20 Hz(rms) residual FM and -31.-37 dB THD on audio band. Requirements for the modulator are discussed
    No preview · Conference Paper · Sep 1997