A 2.4-GHz fully-monolithic silicon-bipolar oscillator circuit implemen
ted in a 12-GHz BICMOS technology is presented. The integrated resonat
or circuit uses three different versions of a 2-nH multilevel inductor
and a wideband capacitive transformer, The measured Q factor is 9.3 f
or the three-level inductor, An oscillator phase noise of -78 dBc/Hz i
s achieved at 20-kHz offset. The circuit dissipates 50 mW from a 3.6-V
supply.