Integration spannungsabstimmbarer Oszillatoren für Mobilfunkanwendungen

The frequency concepts of GSM and DECT systems in mobile handsets consist mainly of three voltage controlled oscillators. The goal of this work is the integration of these oscillators with a bipolar technology. In this paper the requirements for the oscillators are shown. The possibilities of integration are examined theoretically and by experiment. For the GSM system a partly integrated solution is demonstrated and for the DECT system a fully integrated VCO is presented.