A family of monolithic inductor-varactor SiGe-HBT VCOs for 20 GHz to 30 GHz LMDS and fiber-optic receiver applications

摘要

A family of low-phase noise, monolithic inductor-varactor SiGe-HBT VCOs in the 20 GHz to 30 GHz band was fabricated in a production SiGe technology. The unbuffered differential VCOs have 10-15% tuning range and deliver -3 to 2 dBm directly into each of the 50 /spl Omega/ loads, and 0 dBm differentially. Phase noise is as low as -101 dBc/Hz at 1 MHz from the 20 GHz carrier and -87 dBc/Hz at 100 kHz from the 26 GHz carrier. The VCO core draws 10 mA from a 5 V supply.