A multi-band single-loop PLL frequency synthesizer with dynamically-controlled switched tuning VCO

A phase-locked loop (PLL) frequency synthesizer architecture for multiple-band applications is presented. A dynamically-controlled switched tuning voltage-controlled oscillator (VCO) is used to achieve superior frequency range and phase noise performance over a conventional PLL. Implemented in 1.4 /spl mu/m CMOS, the PLL has a 111-290 MHz range, phase noise of -92.3 dBc/Hz at a 50 kHz offset, and dissipates 9 mW from a 2.7 V supply.