A Tuned-Input Tuned-Output VCO in 0.18μm CMOS

A fully-integrated 2.3-2.7GHz differential voltage-controlled oscillator derived from the classical tuned-input tuned-output (
TITO
) topology in 0.18μm CMOS is presented. It uses an auxiliary resonant tank for additional noise suppression and achieves measured phase noise values of -110dBc/Hz and -130.5dBc/Hz at 100 kHz and 1 MHz frequency offsets, respectively. With a current consumption of 7.5mA from a 1.8V supply, it achieves a figure-of-merit of 187.2dBc/Hz.