A voltage-controlled varactorless lc-tank oscillator with a transformer-feedback technique

摘要

A differential-voltage-controlled LC oscillator employs a g(m)-tuned technique instead of a varactor is presented, verified, and measured. The design was demonstrated in a standard 0.18-mu m CMOS process. The oscillator can operate at the range of 4.73-5.05 GHz under a 1.8-V supply voltage. The measured phase noise is -100.76 dBc/Hz at 100-kHz frequency offset and -121.53 dBc/Hz at 1-MHz frequency offset away from the 4.73-GHz carrier with power consumption of 6.48 mW. (C) 2007 Wiley Periodicals, Inc.